Leanne's class C PERIOD 11/12/15
Hello class, today you will be watching this powerpoint presentation on coal energy.
By: Daniela Sanchez
Why is there a TARDIS?
Because why not?
The energy we get from coal today, comes from the energy plants absorbed from the sun millions of years ago.
The energy we get from coal today, comes from the energy plants absorbed from the sun millions of years ago. Coal has many uses. Native Americans used coal to make pottery before the first Americans came to America. People also relied on coal to manufacture goods, power steamships, power railroad engines, make iron and steel, and make electricity. Today, coal produces 21.3% (1/5) of America's energy needs.
There are two methods of coal mining that coal companies use: surface mining and underground mining. Surface mining is used if coal is buried less than 200 feet underground and extracts about 2/3 of coal in the US. Underground mining is used to dig out coal buried deep in the earth. Some mines are even 1,000 feet deep!
Surprisingly, not that much coal is used to heat homes and buildings. About 92% of coal is used to make electricity. The steel and iron industries use coal for smelting metals, but they aren't the only ones using coal; paper, brick, and firestone industries use coal to make their products.
Though we use coal for many different products, it is not the most efficient form of energy. Coal pollutes the Earth. When it is burned, carbon dioxide and sulfur are created. Sulfur mixed with carbon dioxide creates sulfur dioxide. When sulfur dioxide mixes with moisture, it turns into acid rain, which affects trees and water in the area. Coal companies try to find low-sulfur coal and power plants are installing scrubbers to remove most of the sulfur from coal smoke so that it doesn't affect the air. Many coal by-products are used for roads, cement, and ocean reefs for animal habitats.
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