Env. Science 16
ore mineral
minerals that contain valuable substances
longwall
the wall of a coal seam
First step in surface coal mining
to remove and set aside the soil that covers the area to be mined.
alloy
two or more metals that are combined
a serious hazard of coal mining is
an underground mine fire.
before mining a site, a mining company must do things except
cut into a section of the long wall
which of the following is not affected when soil is removed from a surface mine?
deep coal seams
which of the following is one reason why undersea mining has been largely unsuccessful to date
deposits at great water depths are difficult to work
solar evaporation is practical in order to obtain salt from the sea water in climates where rainfall is exceeded by
evaporation
which of the following is not a way that ore minerals may form?
flooding of empty stream beds and rivers
Nonmetallic minerals prized mainly for their beauty, rarity, or durability are called
gemstones
placer deposits
minerals concentrated by wind and water movement into surface deposit
surface mining
mining method used when ore deposits are located close to Earth's surface.
What is a mineral
naturally occurring, usually inorganic solid that has a characteristic chemical composition, orderly internal structure.
quarry
open pit used to mine materials near the surface
smelting
process by which crushed ore is melted at high temperatures to seperate impurities from molten metal
reclamation
process of returning land to its original or better condition after mining
what is the arrangement of atoms in a mineral
regular, repeating geometric patterns
aggregates
sand, gravel, and crushed rock
dredging stream beds may be an effective technique for mining
sulfur
subsidence
the sinking of regions of the ground with little or no horizontal movement