What are two major methods of obtaining coal from the ground?

What are two major methods of obtaining coal from the ground compare these two methods?

Coal can be extracted from the earth either by surface mining or underground mining. Once coal has been extracted, it can be used directly (for heating and industrial processes) or to fuel power plants for electricity. If coal is less than 61 meters (200 feet) underground, it can be extracted through surface mining.

What are two major methods of obtaining coal from the ground quizlet?

Two methods: surface or underground mining with giant machines.

What is one advantage surface coal mining has over other mining techniques?

Surface coal mines must undergo reclamation once they are closed; this reduces the environmental damage of mining but does not eliminate it. Human society runs on energy, and coal continues to be a major reliable energy resource.

What is the formula of coal?

The chemical formula of coal is reported as: C135H96O9NS. Coal is usually taken as 85% carbon based on dry mass.

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Is coal still being formed?

Coal is very old. The formation of coal spans the geologic ages and is still being formed today, just very slowly. Below, a coal slab shows the footprints of a dinosaur (the footprints where made during the peat stage but were preserved during the coalification process).

Is coal less polluting than oil?

Petroleum (crude oil): Produces less CO2 emissions than coal during production. Scientists estimate that reserves may run out of oil in a century or two.

Where does the energy in coal come from quizlet?

The energy in coal comes from the energy stored by plants that lived hundreds of millions of years ago in swampy forests.

How is coal made into electricity quizlet?

Coal is pulverized into small pellets, burned into steam, and then the steam is directed to the blades of a turbine which powers a generator to make electricity.

Is surface or subsurface mining worse?

Subsurface mining is actually less disruptive to the earth and produces less waste than surface mining, but it’s also much less effective and more dangerous. Many workers die in mine collapses, which then also leaves behind a large hole from caving in of the ground above.

What are disadvantages of coal?

The major disadvantage of coal is its negative impact on the environment. Coal-burning energy plants are a major source of air pollution and greenhouse gas emissions. In addition to carbon monoxide and heavy metals like mercury, the use of coal releases sulfur dioxide, a harmful substance linked to acid rain.

What is run of mine coal?

Run-of-mine (ROM) coal

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The coal delivered from the mine that reports to the coal preparation plant is called run-of-mine, or ROM, coal. This is the raw material for the CPP, and consists of coal, rocks, middlings, minerals and contamination.

What are the 4 types of coal?

Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.

What is coal an example of *?

Coal is an example of Sedimentary rocks. Coal is a biochemical sedimentary rock because coal is formed from organic matter or sediment that comes from biological processes. Coal is typically found near swampy areas, or areas where sediment has little contact with oxygen.

What are the 4 stages of coal formation?

There are four stages in coal formation: peat, lignite, bituminous, and anthracite.