Why does air flow into the center of a cyclone?
A. The center of a cyclone is near Earth's surface.
B. The center of a cyclone is a region of low air pressure.
C. The center of a cyclone is a region of cold air.
D. The center of a cyclone is a region of high air pressure.
Answer: B
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Radium in groundwater
A. makes the water unsafe for bathing. B. occurs only near leaking radioactive-waste dumps. C. can be removed by water softeners. D. All of the choices are correct.
Harry Hess proposed the theory of seafloor spreading—the creation of new oceanic crust at mid-ocean ridges
a. True b. False
Explain how a laccolith is similar to a sill. What will be an ideal response?
Examine the figure that shows the sequence of strata in three Colorado Plateau national parks. Which unit(s) are shared by Grand Canyon National Park and Zion National Park?
A) Toroweap and Kaibab B) Kaibab and Monekopi C) Moenkopi and Chinle D) Kaibab only