A refraction pattern in which rays are bent concave upward can be caused by
A) increased moisture.
B) strong winds.
C) a steady, steep drop in temperature with height.
D) low clouds.
Answer: C
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Guano, the excrement of seabirds, can accumulate into phosphate-rich rocks of commercial value. This island nation had an economy entirely based on the mining of phosphate deposits.
A. Nauru B. Bougainville C. Pitcairn D. Ruapehu
Botswana is in ________ Africa
A) north B) southern C) east D) west
When water is pumped from a well, a depression is often produced in the water table. Such a depression is a(n) ________
A) perched water table B) artesian well C) pumping dimple D) cone of depression
If the maximum sustainable yield of a renewable resource is exceeded, it can be considered to have become a nonrenewable resource.
Answer the following statement true (T) or false (F)