Sinkholes mainly occur in arid regions
a. True
b. False
Indicate whether the statement is true or false
False
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In addition to glaciers melting and the oceans acidifying, what other indicators are there of climate change?
A. Birds in the northern hemisphere have expanded their ranges northward. B. Birds in the southern hemisphere have expanded their ranges northward. C. Plants have expanded their range down mountain slopes. D. Bees have expanded their range in the direction of the equator.
Intercepted water that drains across plant leaves and down their stems to the ground is known as
A) stem flow. B) throughfall. C) infiltration. D) overland flow.
By what percentage has the Earth's population grown in the last 20 years?
A) 10% B) 20% C) 30% D) 40% E) 50%
Most of the air pollution that humans experience is located in the
A) mesosphere.
B) thermosphere.
C) stratosphere.
D) troposphere.