In which of the following time periods did coral, clams, fish, plants, and insects become abundant?
A. Precambrian
B. Cenozoic
C. Mesozoic
D. Paleozoic
Answer: D
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Radiant energy emitted by our planet is
A. electromagnetic. B. terrestrial energy. C. the outcome of radioactivity in Earth's interior. D. all of the above
Which of the following explains the blue colour of the sky?
A. transmission of visible light through the ozone layer in the Earth's stratosphere B. filtering effect of water vapour in the Earth's atmosphere C. selective scattering of visible light by air molecules D. reflection of sunlight off the Earth's oceans
Rocks with an imprint of Earth's magnetic code contain
A. polarity, latitude of origin, and the direction of the magnetic pole at the time of formation. B. the rock's polarity, magnetic-pole direction, and the altitude of the magnetic pole. C. polarity, latitude of origin, and fossils indicating the age of the rock. D. all of the above
Botswana, straddling Tropic of Capricorn, experiences most rainfall during ________ due to influence of ITCZ
A) winter B) fall C) summer D) spring