Why has total U.S. cropland been decreasing? What will be an ideal response?
Soil erosion is part of the problem, but other important factors include urbanization and conversion to
other uses. Urbanization has taken some of the best soil in the U.S. out of production and is likely to
continue to do so
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When water vapor condenses it ________.
A. absorbs kinetic energy B. releases latent heat C. absorbs latent heat D. converts kinetic energy
Over the course of a year, the length of an alpine glacier fluctuates seasonally, increasing in winter, melting back in summer.
Answer the following statement true (T) or false (F)
What do these channels indicate about past events on Mars?
A. There were explosive volcanic eruptions. B. Strong winds eroded into a series of volcanic layers. C. Glaciers once covered the entire planet. D. The surface once had running water that eroded and deposited sediment.
Cinder cones typically ____
a. have several fissures b. erupt as lava flows c. are composed of tephra d. form the largest type of volcano