http://www.weatherwizkids.com/weather-earthquake.htm

 

http://www.universetoday.com/74034/what-are-the-layers-of-the-earth/

 

http://www.kidsgeo.com/geology-for-kids/0022-earths-mantle.php

 

http://education.nationalgeographic.com/education/encyclopedia/mantle/?ar_a=1

 

http://education.nationalgeographic.com/education/encyclopedia/core/?ar_a=1

 

http://wps.prenhall.com/esm_thurman_essofocean_8/22/5775/1478435.cw/content/

 

http://www.learner.org/interactives/dynamicearth/plate.html

 

http://www.bbc.co.uk/science/earth/natural_disasters/volcano