What theory explains the formation of a differentiated Earth consisting of layers?
A)Darwin's theory
B)plate tectonic theory
C)Einstein's Theory of Relativity
D)homogeneous accretion theory
E)Big Bang
D
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In the United States the air quality is poorer and drinking water more polluted today than in the 1970s.
Answer the following statement true (T) or false (F)
Explain the three stages of demographic transition as theorized by Frank W. Notestein.
What will be an ideal response?
What has caused the population of the southern sea otters to fluctuate?
A. decline in population of orcas B. parasites that breed in cats C. parasites from dolphins D. high reproductive rates E. extinction of algal species
The difference between open and closed systems is that
A. open systems can acquire matter and energy, but closed systems cannot. B. open systems are not predictable but closed systems are. C. open systems are much simpler in terms of the number of interactions between objects in the system. D. open systems occur on land and closed systems occur in the ocean.