The current population of the Earth is about 3 billion
Indicate whether the statement is true or false
FALSE
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How does a crevasse form?
A) A glacier moves over a volcanic hot spot, causing differential melting and caving it inward. B) A glacier moves across a ridge of particularly resistant rock, which breaks the glacier from the bottom upward. C) Internal stress causes a glacier's upper surface to break as the glacier moves. D) A glacier moves over a pre-existing stream valley, which causes it to fracture on each side of the valley.
The Green Revolution increased agricultural output in the 1960s, but little progress in increasing agricultural productivity has been made since then
Indicate whether the statement is true or false.
In the United States, the use of hydropower
A) is likely to double in the next 20 years. B) is likely to increase by about 40% by 2025. C) will likely stay the same or decrease slightly in the next few decades. D) will decline considerably, as much as 50%, by the year 2030.
Which of the following can influence whether a shoreline gains or loses sand with time?
A. the amount of sediment in rivers B. the amount of precipitation on land C. prevailing wind direction D. a longshore current E. All of these choices are correct.