Coal Coal is a rock that has so much carbon in it that the rock burns. Coal is old. It is millions...
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Transcript of Coal Coal is a rock that has so much carbon in it that the rock burns. Coal is old. It is millions...
![Page 1: Coal Coal is a rock that has so much carbon in it that the rock burns. Coal is old. It is millions of years old. It forms from the same processes that.](https://reader035.fdocuments.us/reader035/viewer/2022072015/56649ebb5503460f94bc4152/html5/thumbnails/1.jpg)
Coal
• Coal is a rock that has so much carbon in it that the rock burns.
• Coal is old. It is millions of years old. It forms from the same processes that form all sedimentary rocks.
• Charcoal is different from coal. Charcoal is made by partially burning wood. It is made now, by people.
![Page 2: Coal Coal is a rock that has so much carbon in it that the rock burns. Coal is old. It is millions of years old. It forms from the same processes that.](https://reader035.fdocuments.us/reader035/viewer/2022072015/56649ebb5503460f94bc4152/html5/thumbnails/2.jpg)
Coal is found in many places in the United States
![Page 3: Coal Coal is a rock that has so much carbon in it that the rock burns. Coal is old. It is millions of years old. It forms from the same processes that.](https://reader035.fdocuments.us/reader035/viewer/2022072015/56649ebb5503460f94bc4152/html5/thumbnails/3.jpg)
Kinds of Coal
Peat: not coal yet, but burnable
Bituminous coal Anthracite Coal
Lignite Coal
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Peat
• Peat is an accumulation of partially decayed vegetation matter.
• Peat forms when plant material, usually in marshy areas, is inhibited from decaying fully by wet and acidic conditions.
• Under the right conditions, peat is the earliest stage in the formation of coal.
![Page 5: Coal Coal is a rock that has so much carbon in it that the rock burns. Coal is old. It is millions of years old. It forms from the same processes that.](https://reader035.fdocuments.us/reader035/viewer/2022072015/56649ebb5503460f94bc4152/html5/thumbnails/5.jpg)
Lignite Coal
• Lignite, often referred to as brown coal, is the lowest rank of coal and used almost exclusively as fuel for steam-electric power generation.
• Lignite contains more moisture than higher ranked coal and when dried, it crumbles easily.
![Page 6: Coal Coal is a rock that has so much carbon in it that the rock burns. Coal is old. It is millions of years old. It forms from the same processes that.](https://reader035.fdocuments.us/reader035/viewer/2022072015/56649ebb5503460f94bc4152/html5/thumbnails/6.jpg)
Bituminous Coal
• Bituminous coal is a relatively hard coal containing a tar-like substance called bitumen. It is of higher quality and rank than lignite.
• It is usually black, sometimes dark brown, often with well-defined bands of bright and dull material associated with sedimentary rocks.
![Page 7: Coal Coal is a rock that has so much carbon in it that the rock burns. Coal is old. It is millions of years old. It forms from the same processes that.](https://reader035.fdocuments.us/reader035/viewer/2022072015/56649ebb5503460f94bc4152/html5/thumbnails/7.jpg)
Anthracite Coal
• Anthracite is the highest rank of all coals. It is a high carbon, low sulfur and high BTU coal. Anthracite is a "smokeless" fuel unlike some of the lower grades of coal. It burns cleaner, hotter and longer than any other coal.
• Anthracite coal is a metamorphic rock and is considered to be a transition stage between ordinary bituminous coal and graphite.
![Page 8: Coal Coal is a rock that has so much carbon in it that the rock burns. Coal is old. It is millions of years old. It forms from the same processes that.](https://reader035.fdocuments.us/reader035/viewer/2022072015/56649ebb5503460f94bc4152/html5/thumbnails/8.jpg)
Coals’ energy comes from the sun
• Plants in the biosphere store solar energy through photosynthesis by converting it into chemical energy in the form of organic (carbon-based) molecules.
• Energy that enters the biosphere nearly equals that lost by oxidation.
• A small percent is stored in the form of fossil fuels in sedimentary rocks
![Page 9: Coal Coal is a rock that has so much carbon in it that the rock burns. Coal is old. It is millions of years old. It forms from the same processes that.](https://reader035.fdocuments.us/reader035/viewer/2022072015/56649ebb5503460f94bc4152/html5/thumbnails/9.jpg)
Formation of Coal
![Page 10: Coal Coal is a rock that has so much carbon in it that the rock burns. Coal is old. It is millions of years old. It forms from the same processes that.](https://reader035.fdocuments.us/reader035/viewer/2022072015/56649ebb5503460f94bc4152/html5/thumbnails/10.jpg)
Steps to form coal
• Thick layers of nearly pure plant material are deposited.
• During compaction by overlying sediment, water and gases are squeezed out.
• The percent of carbon increases as the coal is compacted more, and the rank increases.
• The greater the carbon content, the greater the energy stored in the coal
• Coal also contains sulfur compounds and ash, the unburnable part, composed of sand, silt and clay.
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The greater the time, heat and pressure of burial, the higher the rank of coal