Biogeochemical Cycles

Why do organisms need carbon?

• To create DNA

• To help build proteins

• To help build bones and teeth

• To help build carbohydrates and fats

This process takes CO2 out the atmosphere to break down glucose for energy.

• Photosynthesis

• Decomposition

• Combustion

• Respiration

Which process does NOT put CO2 into the atmosphere?

• Photosynthesis

• Decomposition

• Combustion

• Respiration

____________puts additional CO2 into the atmosphere due to the burning of fossil fuels.

This process moves CO2 in and out of the ocean at equal rates.

• Respiration

• Compaction

• Diffusion

• Photosynthesis

Photosynthesis take __________ to create __________.

• CO2; Carbonic acid

• CO2; glucose

• CO2; CH4

• Glucose; CO2

As organims decompose, CO2 is ________the atmosphere.

• added to

• taken from

Which process that moves carbon is NOT a human process?

• Respiration

• Compaction

• Combustion

• Sedimentation

Which processes that move carbon ARE human processes?

• Combustion

• Mining

• Compaction

• Deforestation

Why do organisms need nitrogen?

• To help build vitamins

• To help build DNA

• To help build carbohydrates

• To help build bones and teeth