Welcome dear students! Today we are going to learn about Australia from Class 7 Social_Science. This chapter introduces the location, extent, and physical setting of Australia, its physical divisions, rivers, climate, natural vegetation, agriculture, animal husbandry, minerals and industries, and population growth, distribution, and density. By the end of this lesson, you will understand Australia's position in the world, its physical features, the relationship between its agriculture and animal husbandry, its minerals and industries, and its population patterns. Let us begin our journey to this fascinating continent!
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First, let us understand the location and extent of Australia. The continent is situated completely in the Southern and Eastern hemispheres. It lies between 10 degrees 45 minutes and 43 degrees 39 minutes South Latitude, and from 113 degrees 9 minutes East to 150 degrees 39 minutes East longitudes. The Tropic of Capricorn passes approximately through the central part. Australia is the smallest continent in both area and population. Including Tasmania, its total area is 76.82 lakh square kilometers. It is slightly smaller than the United States and double the size of India. Its spread is 3940 kilometers from North to South and 4350 kilometers from East to West, with a coastline of 19310 kilometers. The term Australia comes from Austral, a Latin word meaning South. Oceania refers to about 10000 islands of the Central and South Pacific Ocean, with Australia as a key part. Geographically, it lies between the Indian and Pacific Oceans, bounded by the Timor and Arafura Seas in the North West, Torres Strait and Coral Sea in the North East, Tasman Sea in the South East, and the Great Australian Bight in the South.
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Now let us look at the physical divisions and river systems. Ninety four percent of Australia's surface area is less than 600 meters above sea level, consisting of flat low land, earning it the name Flattest Continent. Since deserts cover most of it, it is also called the Desert Continent. Structurally, Australia was part of ancient Gondwana land. Topographically, it divides into three parts: the Eastern Highlands, the Central Lowlands, and the Western Plateau. Discovered by Captain James Cook in the 17th century, it is called the New Continent. The Eastern Highlands stretch from Cape York in the North to the Bass Strait in Tasmania in the South. This mountain range runs parallel to the East coast, with a steep eastern side and a gradual western slope. Early settlers called it the Great Dividing Range because it was a formidable barrier. In New South Wales, it is known as the Australian Alps and New England Ranges. High peaks are snow-covered in winter. Mount Kosciuszko, at 2230 meters, is the continent's highest peak. The Great Barrier Reef extends 2000 kilometers north to south beyond the east coast.
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Next, we study the Central Lowlands. They extend from the Gulf of Carpentaria in the North to the Murray basin in the South, lying west of the Eastern Highlands with many groundwater basins. Rivers here flow toward Lake Eyre in the center. The world's largest artesian basin is located here. The Central Lowlands divide into three parts: the Murray-Darling basin, the Lake Eyre basin, and the Carpentaria Lowlands. The Murray-Darling basin is separated from the Lake Eyre basin, which lies to the north. Due to abundant river water, this part is a rich agricultural area. North of it lies the saucer-shaped Lake Eyre basin, containing many salt lakes. Much of this region is a barren desert and sparsely populated. The Gulf of Carpentaria is a plateau with the Flinders and Mitchell rivers, and this region is separated from the Lake Eyre basin by the Barkly plateau. The third division is the Western Plateau, covering one third of Australia from the Gulf of Carpentaria to Onslow, Perth, and Albania. It includes the Great Sandy, Gibson, and Great Victoria Deserts, and is as old as India's Deccan Plateau. The region features large sand dunes and isolated rocky hills. The MacDonnell and Musgrave ranges are the highest mountains in the central part.
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Let us now study the river systems. Due to aridity and high temperatures, Australia has few small, non-perennial rivers, many flowing into lakes instead of the sea. Most rise in the Eastern Highlands and flow eastward. The Murray is the most important river. It originates near Mount Kosciuszko in southeastern New South Wales, flows west then southwest for 2590 kilometers, and empties into the Bay of Encounter. Its main tributaries are the Darling, Lachlan, and Murrambidgee. It is navigable only in certain seasons. East-flowing rivers are short and swift, including the Hunter, the eastern Fitzroy, and Belyando. In the northeast, the Mitchell, Gilbert, and Flinders flow northwest into the Gulf of Carpentaria. Rivers like the Dally, Victoria, and West Fitzroy flow north and northwest into the Timor Sea. Cooper Creek, Diamantina, and Macumba drain into Lake Eyre. Rivers Murchison, Avon, and Black Wood drain into the Indian Ocean. Australia has few lakes, mostly small salt lakes like Eyre, Gairdner, and Torrence. Lake Eyre is the largest and the lowest natural point. West of it lies Ayers Rock, also known as Uluru, the world's largest monolithic rock.
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Now, let us explore the climate. The Tropic of Capricorn crosses the middle of Australia, creating a tropical and subtropical climate with high temperatures year-round in most areas. A cold ocean current along the western coast causes hot deserts and dry weather there. The north experiences a Monsoon climate, while the southern coast has a Mediterranean climate. Seasons are opposite to the Northern Hemisphere. Winter occurs from June to August. Temperatures are low, decreasing from north to south, while pressure increases. Winds blow from land to sea, bringing little rain, making the climate hot and dry, except in Tasmania. Summer runs from December to February, characterized by high temperatures and low humidity. Western deserts are hotter than the east. The south, southeast, and Tasmania have moderate temperatures. Low pressure inland draws winds from sea to land, bringing some rain. The south and southeast receive more summer rainfall. Australian cyclones are called Willy Willies. Rainfall is monsoon-type and unreliable. Annual rainfall exceeds 75 centimeters in southeastern, northern, and southwestern coastal areas, but drops below 25 centimeters in the vast interior desert.
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Next, we examine natural vegetation. Dense forests are scarce. Grasslands, shrubs, and open woodlands cover most of the continent, reflecting its climate. First, Tropical Forests grow in northern and northeastern coastal areas with higher rainfall. They are scattered and cover a small area, featuring Ash, Cedar, Beach, and Palm trees. Second, Temperate Forests, or mountain forests, grow in hilly areas across Queensland, New South Wales, Victoria, and Tasmania. Eucalyptus and Pine are important here, with Eucalyptus used for oil and paper. Third, Grasslands include Tropical Grasslands, or Savannah Grassland, and Temperate Grasslands, or Downs. Savannah Grassland lies west of the Eastern Highlands in Queensland, central North Australia, and northern West Australia. Downs are largely in the Murray-Darling basin, used for pastoral activity, featuring Tussock, Mitchell, and Astreble grasses. Fourth, Shrub lands grow in southern and western Western Australia, South Australia, and parts of Queensland. Scanty rainfall favors Acacia as the dominant flora, with scattered Eucalyptus, Palm, and thorny cactus. Fifth, Desert Vegetation covers central and eastern Western Australia, featuring Cacti, salt bush grass, dwarf grass, and thorny bushes adapted to dry conditions.
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Let us talk about wildlife. Australia hosts unique animals and birds found nowhere else. The Platypus is a monotreme egg-laying mammal with hairy fur that feeds its young with milk. The Emu is the largest flightless bird. The Lyre is a beautiful peacock-like bird. Kookaburras are known for their laughter-like calls, and black swans are also found here. The Kangaroo is the national animal, carrying its young in a pouch. The Dingo is a wolf-like wild dog. Other species include the Wallaby, fly-eating Echidna, and arboreal Koala bear. Reptiles and poisonous snakes are common. Around 60 percent of native animals and birds are endemic, making Australia a land of rare wildlife, with the Kangaroo as its national symbol. Now, let us study agriculture and animal husbandry. Agriculture is a major occupation, though only 4 percent of land is cultivable, mostly in coastal plains and river basins. Only 44 percent of the population works directly in agriculture, primarily European Australians. Scanty rainfall, infertile sandy soil, and limited irrigation make it less common, but Australia remains mostly self-sufficient. Farming is extensive, with large holdings and modern methods. Commercial crops for export are prioritized. Major crops include wheat, sugarcane, cotton, maize, tobacco, fruits, and vegetables.
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Wheat is the prominent food crop, grown in Southern Australia, Queensland, New South Wales, and Victoria, with the Murray-Darling basin as the key region. Australia exports 70 percent of its wheat. Maize, used for livestock feed, grows mainly in Queensland and New South Wales. Rice is grown on a small scale in the Murray-Darling basin. Sugarcane is cultivated along the eastern coast from Northern New South Wales to Queensland. Tobacco is a cash crop mainly in Queensland. Fruits and vegetables like apples, grapes, guavas, and oranges are grown in large quantities in Tasmania, Victoria, and New South Wales. Animal husbandry is highly important, making Australia famous for pastoral activity. Sheep and cattle are reared for dairy, meat, wool, and leather. Sheep rearing is dominant, making Australia the world's leading producer and exporter of wool and woollen products. Vast grasslands, artesian well water, cool dry climate, modern methods, and wide markets support this. Nearly 75 percent of sheep are Merino breed, yielding fine wool. The vast land where sheep are raised is called 'Stations' or 'Ranches'. Cattle are raised for milk and dairy, with meat production in the Savannah region and dairy in the temperate Downs.
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Let us explore minerals and industries. Australia is rich in iron ore, bauxite, lead, zinc, copper, nickel, tin, manganese, gold, and uranium, plus coal, petroleum, and natural gas. Many are exported. Australia is a major iron ore producer, exporting much to Japan. It holds the world's largest bauxite deposits. Coolgardie and Kalgoorlie are famous gold mining centers in Western Australia, with gold also in New South Wales, Victoria, and Queensland. Copper is largely produced in New South Wales. The Gulf of Carpentaria is a major manganese mining region. Australia has abundant uranium, with 60 percent in the Northern Territory, plus deposits in Western Australia, South Australia, and Queensland. Industries have grown significantly due to mineral wealth, agricultural progress, science and technology, foreign investment, and markets. Industries rely heavily on foreign investors, with Japan being the foremost. Major industries include Iron and Steel, Automobile, Ship building, Electrical machinery, Textiles, Paper, Paperboard and Pulp, and Oil Refining. Aircraft manufacturing in Sydney and Melbourne, flour milling, fruit and fish processing, and chemical industries are also important.
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Now, let us study the population. Australia is small in both area and population. In 2012, it was 20.0 million, just 0.31 percent of the global total. It grew from 1.15 million in 1860, to 10.0 million in 1960, 14.8 million in 1980, and 18.7 million in 1998, showing rapid growth by the century's end. Distribution is uneven and sparse. The vast interior is nearly uninhabited. New South Wales holds one third of the population, Victoria one fourth, followed by South Australia and Tasmania. The north is sparsely populated. Nearly 50 percent live in six cities: Sydney, Melbourne, Brisbane, Adelaide, Perth, and Newcastle. Density is very low, averaging 3 persons per square kilometer. It is high in urban centers like Victoria, New South Wales, Queensland, and Tasmania, moderate in the southeast, and lowest in the 80 percent desert and semi-desert areas. Urban population is 85 percent, rural is 15 percent. Let us review the new terms: Island continent, Gondwana, Saucer shape, Monolithic rock, Coral reef, Kangaroo, Lyre, Dingo, Kookaburra, Wallaby, Echidna, and Koala Bear.
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Now, let us check your understanding with the exercises. Exercise one: Fill in the blanks. One: The Murray and Darling river basins are separated by Lake Eyre. Two: Australian cyclones are called Willy Willies. Three: The Australian Tropical grasslands are called Savannah Grassland. Four: Australia's largest bird is Emu. Five: The only egg laying mammal is Platypus. Exercise two: Answer the following. Six: Why is Australia the flattest continent? Answer: Ninety four percent of its surface is under 600 meters, consisting of flat low land. Seven: Explain location and extent. Answer: It lies in the Southern and Eastern hemispheres between 10 degrees 45 minutes and 43 degrees 39 minutes South Latitude, and 113 degrees 9 minutes to 150 degrees 39 minutes East Longitude. The Tropic of Capricorn crosses the center. Area is 76.82 lakh square kilometers, spanning 3940 kilometers north to south and 4350 kilometers east to west, with a 19310 kilometer coastline. Eight: Major physical divisions? Answer: The Eastern Highlands, Central Lowlands, and Western Plateau. Nine: River system note? Answer: Aridity limits rivers to small, non-perennial ones. Most rise in the Eastern Highlands. The Murray, at 2590 kilometers, is the longest, flowing to the Bay of Encounter with tributaries Darling, Lachlan, and Murrambidgee. East rivers are Hunter, eastern Fitzroy, and Belyando. Northwest rivers like Mitchell, Gilbert, and Flinders join the Gulf of Carpentaria. Dally, Victoria, and West Fitzroy join the Timor Sea. Cooper Creek, Diamantina, and Macumba drain Lake Eyre. Murchison, Avon, and Black Wood drain to the Indian Ocean. Lakes are mostly salt lakes like Eyre, Gairdner, and Torrence.
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Ten: Main crops? Answer: Wheat, maize, rice, sugarcane, tobacco, and fruits and vegetables like apples, grapes, guavas, and oranges. Eleven: Important minerals? Answer: Iron ore, bauxite, lead, zinc, copper, nickel, tin, manganese, gold, uranium, coal, petroleum, and natural gas. Twelve: Important industries? Answer: Iron and Steel, Automobile, Ship building, Electrical machinery, Textiles, Paper, Paperboard and Pulp, Oil Refining, Aircraft manufacturing, flour milling, fruit and fish processing, and chemical industry. Thirteen: Exported products? Answer: 70 percent of wheat, wool and woollen products, iron ore, bauxite, gold, copper, manganese, uranium, coal, petroleum, and natural gas. Fourteen: Why is population density low? Answer: Eighty percent is desert and semi-desert, leaving the interior uninhabited, with an average of only 3 persons per square kilometer. Fifteen: Name the grasslands. Answer: Tropical Grasslands or Savannah Grassland, and Temperate Grasslands or Downs. Now, for the activities. Activity one: Use an atlas to identify and list Australia's mountains, rivers, and lakes, then locate them on an outline map. Locate Mount Kosciuszko, the Great Dividing Range, MacDonnell Range, and Musgrave Range. Locate rivers like Murray, Darling, Lachlan, Murrambidgee, Hunter, eastern Fitzroy, Belyando, Mitchell, Gilbert, Flinders, Dally, Victoria, Cooper Creek, Diamantina, Macumba, Murchison, Avon, and Black Wood. Locate lakes Eyre, Gairdner, and Torrence. Activity two: Observe your local surroundings. List the crops grown, vegetation types, and animals and birds in your area. Go outside, note local crops, list trees and plants, and record common domestic and wild animals and birds.
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Isn't it fascinating how a distant continent holds such unique landscapes, wildlife, and industries? By understanding Australia's geography, climate, and resources, you now have a complete picture of this remarkable island continent. Remember to practice locating these features on maps, and regularly revise the lists of crops, minerals, and wildlife. Thank you for listening! Keep revising and practicing. Goodbye! [CHAPTER_COMPLETE]