Compared to most stellar objects, quasars are more
A. energetic.
B. distant.
C. puzzling.
D. all of these
E. none of these
Answer: D
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The earliest known hominid fossils are from rocks that are ____
a. 1.5 million years old b. 700,000 years old c. 10,000 years old d. 7 million years old e. 4 million years old
Which soil formation characteristic will most strongly influence a soil when it is young? When it is old?
What will be an ideal response?
What is NOT true about the extraction of groundwater?
A. Mining groundwater outpaces accumulation. B. It is considered a finite resource. C. Mining groundwater often leads to subsidence. D. It is called fossil water. E. Mining groundwater will always be a resource.
The idea of continental drift was not proposed until the 1960s, when the first evidence to support it was discovered.
Answer the following statement true (T) or false (F)