Erosion can result in a vicious cycle of worsening erosion because
A) rainwater increasingly soaks into the ground.
B) the accumulation of humus makes erosion more likely.
C) plants are less likely to grow in an eroded region.
D) the pH of the soil increases as erosion continues.
C
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To drop a package to Earth's surface from a satellite in close-Earth orbit, project it
A. ahead at satellite speed. B. straight downward. C. behind at satellite speed. D. none of the above
An apple falls from a tree and hits the ground 5 m below. It hits the ground with a speed of about
A) 5 m/s. B) 10 m/s. C) 15 m/s. D) 20 m/s. E) not enough information given to estimate
Which is the most common ecosystems type on Earth?
Terrestrial Boreal Marine Freshwater
Water movement through the soil and water held in a cylindrical tube result from a common phenomenon. What is this phenomenon?
A) barometric pressure B) surface tension C) capillary action D) vacuum suction