13.5: Cycling of Matter

The water cycle, in which water moves from the atmosphere, to the surface, below ground, and back, is also called the

• biogeochemical cycle

• oxygen cycle

• hydrologic cycle

• nitrogen cycle

Which two biogeochemical cycles depend directly on photosynthesis?

• the hydrologic cycle and the oxygen cycle

• the carbon cycle and the phosphorous cycle

• the nitrogen cycle and the phosphorous cycle

• the oxygen cycle and the carbon cycle

Fossil fuels are part of which of the following cycles?

• oxygen

• carbon

• nitrogen

• phosphorus

What happens during the process of nitrogen fixation?

• bacteria change ammonium into nitrate

• bacteria grow on nodules on plant roots

• bacteria absorb ammonia and excrete ammonium

• bacteria convert gaseous nitrogen into ammonia

Where does most of the phosphorus cycle take place?

• in the atmosphere

• at and below ground level

• on fungi near plant roots

• close to rocky terrain