7. All physical forms of water (solid, liquid, and gas) make up the a. atmosphere.
b. biosphere.
C. hydrosphere.

8. The living portion of the earth is contained within the
a. lithosphere.
b. biosphere.
C. hydrosphere.

9. The correct sequence of layers of the atmosphere from innermost to outermost is
a. troposphere--stratosphere--mesosphe re--thermosphere.
b. mesosphere--stratosphere--thermosph ere--troposphere.
c. thermosphere--stratosphere--mesosph ere--troposphere.

10. Most of Earth's weather occurs in the
a. mesosphere.
b. troposphere.
C. stratosphere.