Teacher resources and professional development across the curriculum
Teacher professional development and classroom resources across the curriculum
Learner Express: Modules for Teaching and Learning
Geologist Andy Kurtz of Boston University describes how lichens and plants speed the process of soil accumulation, creating a chain reaction, which, under the right conditions, can lead to even more rapid accumulation of new soil. Run Time: 00:02:23
Grades 5-8 Standard D. Living organisms have played many roles in the Earth system, including the composition of the atmosphere, producing some kinds of rocks, and contributing to the weathering of rocks.
Soil Formation—Physical and Chemical Weathering
Climate and Rate of Soil Formation