Which energy resource is renewable?
a. coal
b. oil
c. natural gas
d. wind?

The point where two air masses meet is called a

All of the following statements about the biosphere are true except: a. light and heat from the sun do not affect the biosphere. b. the biosphere gets resources from earth's crust, hydrosphere and atmosphere. c. like "biology", the name for the biosphere comes from the greek word for life. d. the biosphere includes all living organisms on earth's surface.

What is the amount of organic matter in all living organisms in a habitat called?