Presentation on theme: "A black rock What is in coal? Comes from the remains of plants that have been compressed over millions of years in the Earth. It is about 75% carbon."— Presentation transcript:
A black rock What is in coal? Comes from the remains of plants that have been compressed over millions of years in the Earth. It is about 75% carbon Also may contain sulfur, hydrogen, oxygen, nitrogen, and other substances.
So, if coal is buried under millions of years of dirt and water, how do we get it out of the Earth?
Surface Mining Shaft Mining Miners use earthmovers to remove surface of the earth to get the coal. If coal is close to the surface of the Earth they will use this method. Miners like this method because it is not as expensive. Unfortunately, it also destroys the land at the surface. Miners dig tunnels into the Earth. Then they use tools and explosives to remove the coal from the rock of the Earth. Some mines are 1,000 feet deep.
After the coal is removed from the Earth it is loaded into mining cars and brought to the surface. Then it is cleaned Then it is loaded on to trains for transportation
Let’s take a break and watch a video. › Return to the website and watch “How do they do it: coal mining?”
Let’s review what we know so far. › Coal is a black rock made up mostly of carbon › It lies beneath millions of years of Earth › Miners work to remove it from the Earth › It is a source of energy for us › Top mining states are Montana, Wyoming, Kentucky, West Virginia, and Pennsylvania
Carbon: a chemical element found in coal as well as plants and animals Fuel: a substance that is used for heat or energy Mine: a place where miners work to get certain materials out of the Earth Nonrenewable: can be used up—there is a limited supply
Why is coal important, and why do miners work so hard to bring the coal to the surface? › The main use of coal today is for electricity. › Plants burn the coal to create steam, the steam powers machines that create electricity.
It is also used to help transform iron into steel. Coal heated to make coke coke can be heated to high temperatures changes iron ore to iron iron is used to make steel The high temperatures give steel strength and flexibility It can then be made into things like bridges and automobiles.
No! We get many things through mining. Let's Do Some Cyber Prospecting! Let's Do Some Cyber Prospecting! › Click on the link and when you arrive, choose a state and click on it to see what they mine. Don’t forget to fill in question 3 as you prospect.
Here are some other types of fuel. Make sure and jot them down in your journal. › We have already learned about coal Do you remember that coal is a nonrenewable substance? › Other nonrenewable fuels oil and natural gas. › Other fuels Ethanol Petroleum
PROS › We have a large supply › It is cheaper to make coal into an energy source than other substances › Provides energy for plants and electricity for homes CONS › Releases pollutants into the air › Coal ash can be highly toxic › Mixes with oxygen when it burns and creates carbon- dioxide, which increases Earth’s temperatures
The Hopi Indians were the first people to use coal in North America. Thomas Edison built a coal-fired electric generating plant in 1882.