The two most abundant elements in Earth's crust are ___.
a) iron and magnesium
b) carbon and hydrogen
c) carbon and oxygen
d) hydrogen and oxygen
e) oxygen and silicon
Ans: e) oxygen and silicon
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A likely scenario for causing the population trend shown in the diagram below is
A) the carrying capacity changed.
B) favorable environmental conditions caused a temporary population explosion above the carrying capacity.
C) a keystone predator was removed from the ecosystem at the point that the population began to decline.
D) primary succession began at the time when the population reached its peak.
Which process most accurately describes the process of water moving from a liquid state in a plant leaf to a gaseous state in the atmosphere?
A. transpiration B. capillary action C. precipitation D. hydrolysis
In the Northern Hemisphere, the water surface of the open ocean moves 45° to the right of the wind
Indicate whether the statement is true or false
The downdraft in an ordinary cell thunderstorm is created mainly by ____
A) the melting of snow in the anvil B) electrical attraction between the cloud and ground C) the release of latent heat as water in the cloud freezes D) evaporating raindrops that make the air cold and heavy