Nitrogen Cycle
Carbon Cycle
Hydrologic Cycle
Sulfur Cycle
Phosphorus Cycle
100
converts nitrates to nitrites
What is denitrification?
100
Carbon dioxide is a reactant in..
What is photosynthesis?
100
the driving force in this cycle is..
What is the sun?
100
sulfur is mostly found in..
What is seawater and sedimentary rocks?
100
The speed of the phosphorus cycle is..
What is slow?
200
bacteria converts gaseous nitrogen to ammonia
What is nitrogen fixation?
200
Carbon dioxide comes from..
What is respiration, human activities, decomposititon, and volcanism?
200
water that collects as droplets on a cold surface when humid air is in contact with it
What is condensation?
200
Plants assimilate sulfur primarily in this form
What is sulfide ions?
200
This is where phosphorus circulates in the phosphorus cycle..
What is through water, the earth's crust, and living organisms?
300
Plants roots absorb and use nitrates.
What is assimilation?
300
Carbon is most abundant here..
What is the ocean?
300
the three states that exist in the water cycle are..
What is vapor, liquid, and ice?
300
the most stable form of sulfur on earth today is..
What is sulfate?
300
the first link in the phosphorus cycle is..
What are plants?
400
This is the name of the bacteria that are important in nitrogen fixation
What is Rhizobium?
400
Plants contribute to the carbon cycle by..
What is through photosynthesis and plant respiration?
400
This part of the hydrogen cycle has to work against gravity
What is evaporation and transpiration?
400
animals obtain sulfur by..
What is eating the biomass of plants or other animals?
400
Phosphorus is typically found in..
What is in terrestrial rock formations and ocean bottom sediments?
500
nitrogen is most useful to plants in this form
What are nitrates?
500
The main human activities that introduce Carbon into the atmosphere..
What is brush clearing, burning wood, burning fossil fuels, clear-cutting forest, and car emissions?
500
This is the effect that global warming has on the water cycle
What is it will most likely speed up the water cycle. If its hotter, more water will be evaporated into the cycle?
500
plants satisfy their nutritional need for sulfur by..
What is assimilating simple mineral compounds from the environment?
500
This happens when phosphorus is released into surface water..
What is it will infiltrate its way into the soil and become immobilized?
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