This eruptive event contributes to sulfur in the atmosphere.
What is volcanic eruption?
100
Carbon dioxide, like water vapor, is capable of this in the atmosphere. A chilling thought.
What is absorbing heat?
200
Porous, water-saturated layers of sand, gravel, or bedrock.
What is an aquifer?
200
A plants most preferred form of nitrogen that is created after two steps in the cycle.
What is nitrate?
200
In terms of time, phosphorus cycles this, compared to water.
What is more slowly?
200
This form of deposition is created when sulfur combines with oxygen and water in the atmosphere.
What is acid rain?
200
Carbon dioxide is an essential reactant in this process.
What is photosynthesis?
300
From a liquid to a gas.
What is evaporation?
300
Uptake of nutrients
What is assimilation?
300
Excess phosphorus from human use in aquatic ecosystems
can lead to this.
What is cultural/artificial eutrophication?
300
Dimethyl sulfide, or DMS, serve this function, aiding in the formation of clouds.
What are condensation nuclei?
300
These tiny plants remove carbon dioxide from sea water and combine with calcium ions to form calcium carbonate that helps build shells.
What are phytoplankton?
400
From solid to a gas.
What is sublimation?
400
Other than bacteria and human industry, this feat of nature can fix nitrogen gas.
What is lightning?
400
Because most soil contains little phosphorus, it is often called this, effecting plant growth.
What is a limiting factor?
400
This action is responsible for about two-thirds of the human input of sulfur dioxide.
What is the burning of fossil fuels?
400
Over millions of years, buried deposits of dead plant matter and bacteria are compressed between layers of sediment where they form this carbon-containing compound.
What fossil fuels?
500
This is needed for atmospheric water vapor to condense into clouds.
What are condensation nuclei?
500
Nitrogenous waste in soil undergoes this process first.
What is ammonification?
500
Marine birds contribute to the phosphorus cycle with this.
What is guano?
500
The name of the gas produced by the anaerobic decay of organisms.
What is hydrogen sulfide?
500
This carbon-containing molecule is the product of combining carbon dioxide and water. The electrons get so excited.