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

Environmental & Atmospheric Sciences

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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.

Environmental & Atmospheric Sciences

All atoms of the same element have the same atomic mass number. Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences

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.

Environmental & Atmospheric Sciences