Cycles of the Earth

Which role does photosynthesis play in the carbon cycle?

• It absorbs carbon from the soil

• It releases carbon into the soil

• It removes carbon dioxide from the atmosphere

• It adds carbon dioxide to the atmosphere

8. Label A is a process that is done by bacteria. These can either be in the root nodules of leguminous plants or in the soil. During this process, nitrogen from the atmosphere is converted into ammonium ions. What is the name of this process?

• Assimilation

• Ammonification

• Nitrogen fixation

• Denitrification

9. Label B is for a group of organisms that help to recycle nitrogen compounds from dead organisms. What is the name for this group of organisms? Give your answer as a single word with no period at the end.

10. Label C is a name for the useful form of nitrogen that plants can take up and use. What is the name of this? Give your answer as a single word with no period at the end.

Proteins are formed during the nitrogen cycle.

• True

• False

Proteins are formed during the nitrogen cycle.

• True

• False

Rain, snow, and hail are all examples of  ____________ in the water cycle.

• evaporation

• precipitation

Water Cycle - Part C?

• Condensation

• Runoff

Water Cycle - Part D?

• Condensation

• Precipitation

What is the energy source for the water cycle?

• the sun
• the earth
• water
• the moon