Which of the following are the evidences of the phenomenon of continental drift? I. The belt of ancient rocks from Brazil coast matches with those from Western Africa. II. The gold deposits of Ghana are derived from the Brazil plateau when the two continents lay side by side. III. The Gondwana system of sediments from India is known to have its counterparts in six different landmasses of the Southern Hemisphere. Select the correct answer using the code given below.
- A.I and III only
- B.I and II only
- C.I, II and III
- D.II and III only
Correct answer
Explanation
The correct answer is C, I, II and III. All three are classic pieces of evidence used to support Alfred Wegener's theory that the continents were once joined.
Wegener proposed in 1912 that all continents formed one supercontinent, Pangaea, which later broke apart. Rocks about 2,000 million years old on the coast of Brazil match those of western Africa, as if the two coasts were once joined like a jigsaw. Ghana has rich placer deposits of gold but no gold-bearing source rock; the gold veins are in Brazil, so the gold must have come from the Brazilian plateau when the two lay side by side. India's Gondwana sediments, with their coal and glacial deposits, have counterparts in six landmasses of the Southern Hemisphere.
A is wrong: it leaves out statement II, the placer gold of Ghana.
B is wrong: it leaves out statement III, the Gondwana sediments.
D is wrong: it leaves out statement I, the matching rock belts.
Exam tip: evidence for drift = jig-saw fit, matching rocks (Brazil–West Africa), placer gold (Ghana–Brazil), tillite, Gondwana sediments, fossils.
Practice Questions
View all2011 Census has divided the working population of India into four major categories. Which one of the following is NOT one of them ?
- A.Cultivators
- B.Domestic workers
- C.Household industrial workers
- D.Agricultural Labourers
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Census 2011 sorted workers into four economic categories: cultivators, agricultural labourers, household industry workers and other workers; domestic workers is not one of them.
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- A.Kuwait
- B.Oman
- C.Libya
- D.Yemen
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Libya lies in North Africa, west of Egypt, and is separated from the Arabian Peninsula by Egypt and the Red Sea.
Read the full explanation →Which one of the following is a cold ocean current ?
- A.Brazilian Current
- B.Gulf Stream
- C.North Equatorial Current
- D.California Current
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Read the full explanation →Rani told her friends that last year she did boating in four different lakes, namely, Loktak, Barapani, Kolleru and Pulicat. Which of the following States did she visit?
- A.Manipur, Meghalaya, Kerala, Tamil Nadu
- B.Manipur, Meghalaya, Andhra Pradesh, Tamil Nadu
- C.Mizoram, Assam, Kerala, Tamil Nadu
- D.Mizoram, Assam, Andhra Pradesh, Tamil Nadu
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Read the full explanation →Consider the following statements on 'Fog' : 1. Fog is simply a cloud that forms close to the ground. 2. Radiation fog is associated with radiation cooling of the land at night. 3. Advection fog forms when moisture is blown over a cold surface and is chilled by contact. Which of the statements given above are correct ?
- A.1 and 2 only
- B.2 and 3 only
- C.1 and 3 only
- D.1, 2 and 3
Show answer
All three statements are correct descriptions of fog and its two main types. Fog forms when air near the ground cools to its dew point and its water vapour condenses on tiny dust and smoke particles, so it is in effect a cloud at or near ground level.
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