The Antarctic ozone hole
A) appears when polar stratospheric clouds evaporate.
B) is about the same intensity as that found over Arctic regions.
C) had nearly disappeared by the end of the 1980s.
D) appears in the upper troposphere.
E) appears only when no direct sunlight hits the atmosphere above Antarctica.
A
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The Holocene epoch has been
A. a glacial period. B. a Pleistocene period. C. a glacial and interglacial ice age. D. an interglacial period.
Which of the following involves the release of latent heat back into the environment?
A) Evaporation B) Deposition C) Melting D) Sublimation
Which of the following is NOT a major source of human greenhouse gas emissions?
a. agriculture b. deforestation c. cement production d. burning of coal e. livestock
What component is responsible for the generation of Earth’s magnetic field?
A. asthenosphere B. outer core C. lithosphere D. inner core E. Mohorovi?i? discontinuity