http://teacher.scholastic.com/dirt/erosion/whateros.htm Full article >>> erosion What is Erosion? - Scholastic Site scholastic.com http://teacher.scholastic.com/dirt/erosion/whateros.htm Scholastic: O que é a erosão? [em inglês] http://teacher.scholastic.com/dirt/erosion/whateros.htm Dirt Meister's Erosion What is erosion?