1 - coal is made by fossil fuels, crude oil is made of decomposed organisms, and metals.

2 - millions of years?

3 - started 500 million years ago.

Groin

A groyne is built on shores and rivers to interrupt water flow.
A consequence for building a groyne is that when the water starts to move the other way its carrying on with more strength and bring destruction with it.

• method, construction. "Groyne - Wikipedia, the free encyclopedia."Wikipedia, the free encyclopedia. N.p., n.d. Web. 10 Jan. 2013. <http://en.wikipedia.org/wiki/Groyne>.
  
  

2012 Earthquake

Soil Conservation

Windbreak is a technique of using lines or rows of trees and plants to keep the wind from the plants. (EROSION) 


"Windbreak - Wikipedia, the free encyclopedia." Wikipedia, the free encyclopedia. N.p., n.d. Web. 3 Jan. 2013. <http://en.wikipedia.org/wiki/Windbreak>.