Exploring Continents: Africa, Australia and Antarctica — Class 8 Social Science (Samacheer Kalvi)
TN State Board (Samacheer Kalvi) Class 8 Social Science, Geography — Chapter 7. Three very different continents.
1. About this lesson
This lesson explores three continents — Africa, Australia and Antarctica — their location, physical features and special facts.
2. Africa — the "Mother Continent"
- Africa is called the "Mother Continent" as it is the oldest inhabited continent on Earth. The Equator passes through its middle.
- The Sahara (the world's largest hot desert) lies in the north.
- Important rivers: the Nile (the longest river in the world), Congo (Zaire), Niger, Zambezi, Orange and Limpopo.
- Mt. Kilimanjaro is the highest peak of Africa; the Atlas Mountains lie in the north-west.
3. Australia — the island continent
- Australia is the smallest continent, lying entirely in the Southern Hemisphere.
- Its three physical divisions are the Great Western Plateau, the Central Lowlands and the Eastern Highlands.
- Eucalyptus is the most common tree; the kangaroo and koala are unique animals.
- The Great Barrier Reef off the north-east coast, built by tiny coral polyps, is about 2300 km long — the world's largest coral reef.
4. Antarctica — the "continent of Science"
- Antarctica is the coldest continent, almost entirely covered by a permanent ice sheet; it surrounds the South Pole.
- It has no permanent human population; scientists of any nation may do research there, so it is called the "continent of Science".
- India's research stations include Dakshin Gangotri (the first), Maitri and Bharati.
5. Worked examples
Example 1. Why is Africa called the "Mother Continent"? Because it is the oldest inhabited continent.
Example 2. What is the most common tree in Australia? Eucalyptus.
Example 3. Which was India's first research station in Antarctica? Dakshin Gangotri.
6. Book-back questions (Samacheer Kalvi)
I. Choose the correct answer
- Africa is called the — (a) Mother Continent / (b) Island Continent. Ans: (a) Mother Continent.
- The highest peak of Africa is — (a) Mt. Kilimanjaro / (b) Mt. Kosciuszko. Ans: (a) Mt. Kilimanjaro.
- The Great Barrier Reef lies off the coast of — (a) Australia / (b) Africa. Ans: (a) Australia.
- The coldest continent is — (a) Antarctica / (b) Africa. Ans: (a) Antarctica.
- India's first research station in Antarctica was — (a) Dakshin Gangotri / (b) Maitri. Ans: (a) Dakshin Gangotri.
II. Fill in the blanks 6. The largest hot desert, the Sahara, lies in northern Africa. 7. The most common tree in Australia is eucalyptus. 8. Antarctica is called the continent of Science.
III. Answer briefly 9. Name the three physical divisions of Australia. 10. Why is Antarctica called the "continent of Science"?
7. Common mistakes
- Mistake: Calling Australia the "Mother Continent". Fix: Africa is the Mother Continent; Australia is the island/smallest continent.
- Mistake: Placing the Great Barrier Reef off Africa. Fix: It lies off north-east Australia.
- Mistake: Saying Antarctica has cities. Fix: Antarctica has no permanent population — only research stations.
8. Quick revision
- Geography Ch 7 · Africa, Australia, Antarctica.
- Africa = Mother Continent; Sahara, Nile (longest river), Mt. Kilimanjaro (highest peak).
- Australia = smallest continent; Great Western Plateau / Central Lowlands / Eastern Highlands; eucalyptus, Great Barrier Reef (~2300 km, coral polyps).
- Antarctica = coldest, ice-covered, "continent of Science"; India's stations: Dakshin Gangotri, Maitri, Bharati.
