Water
Carbon
Nitrogen
Phosphorus & Sulfur
General
100
Examples include rain, snow, and hail.

What is precipitation? 

100

This is a natural process that removes carbon dioxide directly from the atmosphere to produce carbohydrates and oxygen gas.

What is photosynthesis?

100

This is the type of organism, found in the soil, that "fixes" atmospheric nitrogen so that it can be absorbed and used by plants.

What is Bacteria?

100

This a region/location that is totally absent from Phosphorus cycle, while being a primary feature in the water, carbon, and nitrogen cycles.

What is the atmosphere?

100

These organisms are involved in EVERY cycle and are the ONLY reason why the nutrients are able to enter our food chains.

What are plants (producers)?

200

Warm waters (ponds, lakes, and even oceans) will experience this, the process of water transitioning from liquid form into vapor (gas), bringing with it any dissolved molecules. 

What is evaporation?

200

This is the process of burning fossil fuels, which releases carbon directly into the atmosphere 

What is Combustion?

200

Humans impact the nitrogen cycle by producing this product which is designed to help crops grow faster and larger.

What are Fertilizers?

200

In the atmosphere sulfur reacts with water vapor, and becomes THIS, which falls down to earth and harms plants as well as animals.

What is Acid Rain?

200

In THIS type of symbiotic relationship, plants produce oxygen that animals breathe, and in return, animals release carbon dioxide that plants use for photosynthesis.

What is mutualism?

300

This is when water in it's liquid form evaporates from the pore of leaves.

What is Transpiration?

300

This is the largest active reservoir for carbon do to CO2 solubility.

What are Oceans?

300

This term refers to the conversion of nitrates (NO3– ) to nitrogen gas (N2), which is emitted into the atmosphere.

What is Denitrification?

300

This is the largest reservoir of phosphorus.

Rocks, sediment, soil.

300

This occurs when the environment becomes enriched with nutrients (specifically N & P), increasing the amount of algae growth in aquatic ecosystems.

What is Eutrophication?

400

The "horizontal" movement of water (and substances carried in it) from the surface of an area of land as it moves across the watershed.

What is runoff?

400

This is a naturally occurring, abiotic process that will suddenly release TREMENDOUS amounts of CO2 into the atmosphere.

What are volcanic eruptions?

400

Plants most easily use THIS FORM of nitrogen. Partially because it is readily available in the soil and moves easily with water towards plant roots. 

What is Nitrate (NO3-)

400

Humans contribute, or add excess, phosphorus to the cycle through poor mining practices and until 1990 it was an ingredient in this household product. 

What is laundry detergent? 

400

This is a place, region, or location where a biogeochemical element is in its highest concentration.

What is a Reservoir?

500

The process by which water moves "vertically" through the soil, giving rise to leaching of molecules. The rate of this process depends on the specific physical properties of the soil.

What is percolation?

500

Carbon dioxide may be the primary greenhouse gas in our atmosphere, but what gas is right behind it (in second place)

What is methane?
500

The nitrogen fixation step is typically completed by bacteria in the soil. However, The high temperature of THIS can break the bonds of atmospheric nitrogen molecules making the compound usable by plants 

What is Lightning?

500

These cellular components are made of phosphorus.
(4 things)

What is DNA, RNA, ATP, and Cell Membranes?

500

This is a nutrient required for the growth of an organism but available in a lower quantity than other nutrients

What is a Limiting Nutrient?

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