Indications of past climates in tree rings are determined by examination of the:a
thickness of growth rings
b. density of growth rings
c. presence of frost rings
d. all of the above
e. only a and b
d
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What evidence supports the hypothesis that a meteorite impact might have caused the extinction at the end of the
Mesozoic? What will be an ideal response?
The largest mass extinction took place some 250 million years ago and wiped about 65% of the world's existing species.
Answer the following statement true (T) or false (F)
What is the overall objective of environmental public policy and what are the objective's two most central concerns?
What will be an ideal response?
Which of the following atmospheric conditions are required for thunderstorms to occur?
A. rising air B. hot, humid air C. divergence of the air aloft D. surface heating