Fill in the blanks with the words in the word bank on the right. Use each word only once.
1. Coal is called a
because it was made from plants millions to hundreds of millions of years ago.
2. Coal is
; you can not make more in a short time.
3. When coal is near the surface, the Earth is scraped off the coal in a
4. To reach coal buried far underground,
are dug. This is called
5. Making the mined land usable again is called
6. Coal is burned in a power plant to make
7. Most coal is moved by
8. Coal can
the air when it is burned.
9. Power plants use
to clean the emissions from burning the coal.