In the Southern Hemisphere, the greatest number of daylight hours occurs on ________.

December 21
June 21
March 21
September 21


December 21

Environmental & Atmospheric Sciences

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When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is

A) iron gets hotter before copper. B) copper gets hotter before iron. C) copper expands more than iron. D) iron expands more than copper. E) none of the above

Environmental & Atmospheric Sciences

In an ecosystem, the elimination of one new species by another because of direct competition for the same resources is an example of

A) intraspecific competition. B) the competitive exclusion principle. C) character displacement. D) resource partitioning.

Environmental & Atmospheric Sciences

The planet with the highest density is a terrestrial planet

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

The intensity of cosmic rays bombarding Earth's surface is largest at the

A) poles. B) midlatitudes. C) equator.

Environmental & Atmospheric Sciences