Deserts occur primarily in the Africa, Arabia, and Australia because of ________
A) rising air currents
B) high temperatures
C) mountains that block the moisture and long distances from the oceans
D) subsiding air currents
D
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Why is Mars' greenhouse effect negligible compared to that of Earth?
A. The Martian atmosphere is much thinner and retains little heat. B. Martian carbon dioxide contains a rare isotope with little ability to trap heat. C. Its mass is only one-ninth of Earth's. D. Greenhouse gas emissions were greatly curtailed according to the International Mars Greenhouse Gas Reduction Treaty of 2003.
All atoms of the same element have the same atomic mass number. Indicate whether the statement is true or false
Entrenchment of a channel occurs because
A) a decrease in stream gradient occurs. B) a change in the bed load size-distribution occurs. C) the river flows from consolidated rock into a region composed of loose sediments. D) rejuvenation occurs due to uplift. E) isostatic downwarping of the crust occurs.
Which of the following whales feeds by moving through surface waters with their mouths open, skimming for small surface-dwelling prey?
A) Blue whale B) Gray whale C) Humpback whale D) Minke whale E) Right whale