When viewing the planets, Mars appears to move backwards, or retrograde, because ________
A) it is rotating around the sun slower than the earth's rotation
B) it is rotating at approximately the same speed but its orbit is more elliptical than the earth's rotation
C) it is rotating at approximately the same speed but its orbit is more circular than earth's orbit
D) it is rotating around the sun faster than the earth's rotation
A
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43% of the commercial energy used in the U.S. is unnecessarily wasted.
Answer the following statement true (T) or false (F)
Urban planners suggest that it takes a population of about ________ to obtain the advantages of a city but still retain the sense of community.
A. 30,000 to 50,000 B. 90,000 to 100,000 C. 2500 to 5000 D. 500 to 1000
On average, algal beds and reefs have higher net primary productivity than tropical rain forests
Indicate whether the statement is true or false
Long, narrow deposits of sand that form offshore roughly parallel to the coast are called
A) baymouth bar. B) barrier beaches. C) groins. D) tombolos.