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.