The margins of glaciers are usually darker than the interior primarily because
A) shearing causes the ice to expel air and become darker.
B) glaciers are transparent so the underlying bedrock is visible.
C) the sides are moving faster than the interior of the glacier.
D) the sides have a higher concentration of rocks and other debris.
E) All of these are correct.
D) the sides have a higher concentration of rocks and other debris.
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The high concentration of iridium at the Cretaceous Tertiary boundary may be attributable to
A. an out flux of iridium from Earth's interior. B. meteorite bombardment. C. a worldwide rise in sea level. D. none of the above
From smallest to largest by land area are these South Asia countries:
A) India, Pakistan, Sri Lanka B) Bhutan, Sri Lanka, Pakistan C) Nepal, India, Bangladesh D) India, Maldives, Nepal
What are the cloud cover and atmospheric pressure conditions near the equator?
A. high pressure and sparse cloud cover B. high pressure and dense cloud cover C. low pressure and dense cloud cover D. low pressure and sparse cloud cover
Wind turbines are generally more productive if they are ________
A) larger, to increase heat convection from the ground B) smaller, to minimize the number of birds that interfere with blade turning C) smaller, to increase heat convection from the ground D) lower, to minimize turbulence and maximize wind speed E) higher, to minimize turbulence and maximize wind speed