How do trees counteract global warming?
A. They shade Earth's surface.
B. They transpire water vapor into the air.
C. They are carbon sinks, taking carbon dioxide out of the air.
D. They produce oxygen.
Answer: C
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Why are smaller nuclei such as carbon-14 often radioactive? (carbon-12 is the most common and most stable form of carbon.)
A) The attractive force of the nucleons has a limited range. B) The isolated neutron is not stable and will undergo spontaneous transformation into a proton and an electron. C) Hmmm... mysterious are the ways of the force. D) both A and B E) none of the above
What is meant when rocks are said to be deformed (fractured or folded)? What will be an ideal response?
Sometimes formations on land can shed light on ocean processes. What do the White Cliffs of Dover in England show?
A) An accumulation of diatomaceous earth that has risen above sea level from plate tectonics. B) An accumulation of siliceous ooze that has risen above sea level from plate tectonics. C) Sediment that has undergone lithification and pushed above sea level from plate tectonics. D) All of these choices are true of the White Cliffs of Dover.
Rhyolite is considerably more common than granite.
Answer the following statement true (T) or false (F)