Halos
A) are most common when the sky is clear.
B) require a thin and uniform layer of ice crystals.
C) are usually found within five degrees of the Sun.
D) occur with the Sun, but not the Moon.
E) are caused by reflection of light.
B
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Horizon A in a soil is ____
A)low in organic matter B)the site of little biological activity C)comprised entirely of sand and gravel D)where the parent material of the soil is located E)composed mostly of clays and stable minerals
Pollution without a central source of origin is termed
A) air pollution. B) regional-scale pollution. C) water pollution. D) nonpoint-source pollution. E) a renewable resource.
What is the world's leading renewable energy source used to produce electricity?
A. hydrogen B. biomass C. ethanol D. hydropower E. coal
Define the term invasive species and give two examples from your textbook
What will be an ideal response?