A hurricane rotates about its eye, which is a(n)
A. rainstorm.
B. calm area of low pressure.
C. turbulent area of high pressure.
D. area of high moisture.
Answer: B
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What can you deduce about the activation energy of a reaction that takes billions of years to go to completion? How about a reaction that takes only fractions of a second?
A) The activation energy of both these reactions must be very low. B) The activation energy of both these reactions must be very high. C) The slow reaction must have a high activation energy while the fast reaction must have a low activation energy. D) The slow reaction must have a low activation energy while the fast reaction must have a high activation energy.
Rudist bivalves were an important component of the Mesozoic reef community
a. True b. False
Evidence from proxies indicate eight major oscillations in global temperatures over the past 800,000 years, most likely the result of:
A) rising and falling sea levels that greatly impact photosynthetic activity.
B) variations in solar activity that produce different levels of radiation.
C) Milankovitch cycles of periodic variations in Earth's orbits around the sun.
D) lunar cycles in which the moon orbits at different distances from the Earth.
Removal of vegetation from a slope increases landslide danger because vegetation ____
a. ?removes water from the soil b. ?removes clays from the soil c. ?holds the surface in a homogenous layer d. ?concentrates water in the soil e. ?amplifies the effect of shock and vibration