Works Cited
Continents in Collision: Pangea Ultima. (2000, October 6). 5 Dec. 2008 http://science.nasa.gov/headlines/y2000/ast06oct_1.htm.
How can you tell rocks on another planet apart? (N.d.). Earth and Apace Sciences. University of Washington. http://depts.washington.edu/rocknout/Lesson%20Plans/Rocks_Mars_Rover.pdf.
Kerr, Richard a. "Signs of plate tectonics on an infant Mars" Science. Washington. Apr 30. 1999. Vol. 264. lss. 5416; pp. 719-721.
The Columbia Encyclopedia, Sixth Edition. 2008. HighBeam Research. 5 Dec. 2008 http://www.highbeam.com.