Carbon CycleUse the diagrams to answer the questions

1. Name several human activities that affect the carbon cycle?a.b.

2. What is the largest carbon sink?

3. Which carbon exchange has the highest amount of exchange?

4. How much oil and gas make up earth’s carbon and is it a large or small portion of the earth’s carbon?

5. What three processes are involved with terrestrial organisms?a.b.c.

Phosphorus Cylce

1. Where is phosphorous stored?

2. Is Phosphorous stored in the atmosphere?

3. What process is responsible for exposing phosphate rocks to the earth’s surface?

4. What process is then responsible for releasing phosphate in rocks and putting it in the soil to be used by plants?

5. Where is the majority of the earth’s phosphorous found?

Nitrogen Cycle

1. How is denitrification different from nitrification?

2. How is nitrogen fixed in the soil?

3. How is nitrogen fixed in the atmosphere?

4. What forms of nitrogen can plants use? ______________________________________________

5. Name 2 ways humans can affect the nitrogen cycle.1. ______________________________________

2. ______________________________________

6. Do you think that the three elements discussed actually cycle?? In other words, are they destroyed or do they just changing form?

True or False

Beside each statement below, write the letter T if you think the statement is true or F if you think it is false. If you think the statement is false, write the correct sentence in the space provided.

1._____ Green plants add carbon dioxide to our atmosphere through a process of photosynthesis.

2._____ Decomposers are a very important part of every nutrient cycle.

3._____ Green plants occupy the second trophic level in food chains.

4._____ There is a loss of energy at each trophic level.

5._____ Carrying capacity is the largest number of organisms that can survive in an area.

6._____ In a food chain, a deer feeding off leaves would be a secondary consumer.

7._____ Carnivores are organisms that eat plant material.

8._____ The process of nitrogen fixation uses oxygen to produce carbon dioxide.

9._____ While a pyramid of numbers or biomass can be inverted, a pyramid of energy cannot.