Name ____________________________
Block: ________
Date: ______________________
Cycles worksheet Review
Please answer the following using the notes from your jigsaw activity.
Carbon Cycle
coal
oil
natural gas
cell respiration
1.
burning of fossil fuels
ocean
volcanoes
sugar
photosynthesis
decayed
Plants use CO2 in the process of ______________________ to make _____________________ and
oxygen.
2.
Animals use oxygen in the process of ______________________________ and make more CO2.
3.
The ______________________ is the main regulator of CO2 in the atmosphere because CO2 dissolves easily in it.
4.
In the past, huge deposits of carbon were stored as dead plants and animals ____________________________ in the
natural environment.
5.
Today these deposits are burned as fossil fuels, which include ______________________________,
___________________________, and ________________________________.
6.
More CO2 is released in the atmosphere today than in the past because of the _____________________________
___________________________________ .
7.
Another natural source for CO2 is _________________________________________.
_____________
Nitrogen Cycle
atmosphere
nitrogen-fixing
78%
ammonia
proteins
denitrification
plants
animals
waste
nitrate
plants
1.
Our atmosphere is ___________________ nitrogen gas.
2.
Animals and plants cannot directly use all the nitrogen found in our _______________________________.
3.
Only special bacteria can directly use nitrogen in our atmosphere and “fix” it so other organisms can benefit.
These bacteria are called ________________________________________ bacteria.
4.
Higher organisms use nitrogen to make their __________________________________.
5.
Animal waste decay by the action of bacteria which create ___________________________________and
______________________________ products rich in nitrogen, and useful for plants to use again.
6.
_______________________________________ bacteria in the soil can break down the ammonia into the gaseous
form of nitrogen, which is not available for use by plants or animals.
7.
In another part of the cycle, animals eat ___________________________ containing nitrogen, which is again
returned to the soil by animal _____________________ or decaying _____________________ and
__________________________.
Water Cycle
evaporates
condense
clouds
transpiration
groundwater
precipitation
surface runoff
1.
Water molecules typically enter the atmosphere as water vapor, a gas, when they
______________________________________ from the ocean or other bodies of water..
2.
Water can also enter the atmosphere by ________________________________________ which involves the
evaporation of water from the leaves of plants.
3.
If air carrying water molecules cools, the water vapor will _________________________ and form
_________________________________.
4.
____________________________________________ flows along the surface of the land and enters a river or
stream, eventually finding the ocean.
5.
When precipitation enter the ground this is called ____________________________________________.
6.
When droplets in the atmosphere become large enough they will eventually form
______________________________________________.
Phosphorus Cycle
sediments
rivers/streams
rocks and minerals
waste
DNA
fertilizers
producers
RNA
1. Phosphorus in NOT found in the free state in Nature, but is contained mostly in _______ and ______________.
2. It is an essential nutrient for life, as it makes up important biological chemicals such as _______ and _______.
3. In the Phosphorus Cycle, phosphorus moves between the soil and ___________, which are eaten by animals. The animals
use phosphorus, and then their ___________ products help return the phosphates for the next generation of phosphorus in
the soil.
4. Some of the phosphorus in soils can be washed away into the ________________________.
5. Another source of phosphorus in water comes from man-made _____________ which have been applied to crops .
6. Geologic activity will turn marine phosphorus rich ____________________ into rock.