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