National Environmental Education Foundation just put out a downloadable booklet containing great Math connections for all levels.

It is an easy way to find a strong math lesson that is connected to the outdoors. My favorite lesson is the Mathabitat where students

build a trophic pyramid for three ecosystems: alpine, rainforest , and river. Then complete each puzzle by dragging food web

components into the trophic pyramid and using algebra to figure out which components fit in each ecosystem.