Biogeochemical Cycles Review

Water molecules enter the atmosphere when they ________ from bodies of water.

• precipitate

• evaporate

• condense

• infiltrate

During _____, water enters the atmosphere by evaporating from the leaves of plants.

• photosynthesis

• evaporation

• precipitation

• transpiration

Human activities such as ____________ cycle carbon through the carbon cycle.

• consumption

• photosynthesis

• burning fossil fuels

• decay

Plants use ____ to build organic molecules during _____.

• CO2; photosynthesis

• O2; photosynthesis

• CO2; respiration

• O2; respiration

The conversion of atmospheric nitrogen into a form used by plants is a process called _____

• ammonification

• denitrification

• nitrogen fixation

• decay

The conversion of usable nitrogen from the soil into unusable nitrogen gas in the atmosphere is called _____

• ammonification

• denitrification

• nitrogen fixation

• decay

Nitrogen fixing ______ live in the _____ or within _____ of plants.

• bacteria; water; leaves

• bacteria; air; stems

• bacteria; soil; flowers

• bacteria; soil; roots

What is the only process that removes carbon from the atmosphere?

• combustion
• cellular respiration
• photosynthesis
• decomposition

Carbon is found in which energy sources?

• Fossil fuels such as oil, coal, and natural gas

• Fossil fuels such as water, oil, and wind

• Renewable energy sources such as geothermal energy and water

• None of the above

These gases, such as carbon dioxide and methane, trap heat in the Earth's atmosphere causing global warming

• Global warming gases
• Hot House gases
• Green House gases
• Thermal pollution