Env Finals 5
____________________ is any rock sufficiently enriched in one or more minerals to be mined profitably.
ore
Petroleum, coal, and natural gas are called ____________________ ____________________ because they formed from the remains of plants and animals that lived in the geologic past.
fossil fuels
____________________ energy resources are replenished by natural processes as we use them.
renewable
Evaporite deposits form by ____.
precipitation from water
The color of ____ is caused by precipitation of fine-grained metal sulfide minerals.
black smokers
____ is formed as a residual deposit in warm climates.
bauxite
Coal reserves are thought to be sufficient to last a few ____.
centuries
____ releases no sulfur when burned, has a higher net energy yield than other fossil fuels, and can be extracted and used without refining.
natural gases
Tar sands are permeated with ____.
bitumen
The major fuel in nuclear power plants is an isotope of ____.
uranium
A nonmetallic resource is:
any useful rock or mineral that is not a metal, such as salt, building stone, sand, or gravel.
In a placer deposit, gold settles out first when the stream current slows down because:
gold is denser than any other mineral
Placer ore deposits form:
when streams or waves sort sediment according to density
Most of the world’s iron is mined from:
banded iron formations
Mineral reserves:
can increase because new and inexpensive methods of processing lower grade ore can be developed and can become profitable if the price of the metal in a mineral deposit increases
Fossil fuels are:
formed from the remains of plants and animals
Mineral reserves remain constant over time.
False
Fossil Fuels are renewable.
False
Plant matter is composed mainly of carbon, hydrogen, and silicon.
False
A solar cell produces energy directly from sunlight
True
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