Erosion can result in a positive feedback loop because ________
A) the accumulation of humus makes erosion more likely
B) the pH of the soil increases as erosion continues
C) rainwater increasingly soaks into the ground
D) greater weathering of parent material will occur
E) plants are less likely to grow in eroded soil
Answer: E
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It is believed the most prominent means by which humans add CO2 to the atmosphere is by ________.
A) the burning of coal and other fossil fuels B) renewable energy C) nuclear electric power D) solar power
A sample of iron weighs more after it rusts because
A. it has expanded into a greater volume. B. of the additional oxygen it contains. C. rust contains twice as many iron atoms. D. Wrong. Iron actually weighs less after it rusts.
Surface waves are the fastest earthquake waves.
Answer the following statement true (T) or false (F)
If no action is taken to limit greenhouse gas emissions over the next century, sea level is predicted to rise by approximately ________ meters
A) 3.0 B) 1.0 C) 0.5 D) 1.5 E) 0.3