Coal is used primarily as an energy source either for heat or electricity.
100
Is coal a fossil fuel or a rock
Fossil Fuel
100
What type of coal is the softest
Lignite
100
What are some ways
tunneling, digging and manually extracting the coal on carts
100
Coal was formed about
3 Million years ago
200
What was it once used for
to heat homes, Power locomotives and factories
200
Coal was believed to form during the
carboniferous age
200
the hardest coal with highest carbon content and lowest moisture and ash content is
anthracite
200
What kind of mining is there
Surface and underground
200
Coal is a fossil fuel true or false
True
300
What percentage is coal used for in the united states
about 50% of electricity is generated from coal
300
Coal is composed primarily of
Name at least three
Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen
300
medium soft with a moisture content lower than lignite is
Sub bituminous coal
300
What is surface mining
is when a coal seam is located close to the surface
300
Coal is transported mostly by
Train
400
Name three ways coal is used to make things
used by many manufacturing plants and industries to make paper, chemicals, steel, metal products, plastics, ceramics, fertilizers and coal tar.
400
Coal is a small piece of
small piece of combustible material: any small piece of combustible material
400
What are some ways to identify different kinds of coal
Heating value, ash melting temperature, sulfur and other impurities, mechanical strength, and many other chemical and physical properties must be considered when matching specific coals to a particular application.
400
What is underground Mining
When the coal seam is found deep underground
400
Coal is mined in
27 US States
500
Coal is also used for producing
Coal is also used for producing coke
500
What layers is coal mostly in
is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams.
500
Which kind of coal is ranked lowest and youngest of the coal
Lignite ranks the lowest and is the youngest of the coals