Unit 8: External dynamics of the Earth

https://evaprofebio.jimdo.com/biology-and-geology-1st-eso/ud-11-la-dinamica-externa-de-la-tierra/

http://highered.mheducation.com/olcweb/cgi/pluginpop.cgi?it=swf::640::480::/sites/dl/free/0072402466/30425/10_14.swf::Fig.%2010.14%20-%20Modes%20of%20Sediment%20Transport

How ice craks rocks:
http://www.harcourtschool.com/activity/science_up_close/307/deploy/interface.html