If repeated experiments or tests using models support a particular hypothesis it becomes this.
What is scientific theory?
100
Most prevalent gas in the atmosphere.
What is nitrogen?
100
This eruptive force is a major contributor to atmospheric sulfur.
What is a volcano?
100
This part of the biosphere is not included in the cycling of phosphorus.
What is the atmosphere?
100
7
What is neutral?
200
The way scientists gather data and formulate and test scientific hypotheses, models, theories, and laws.
What is the scientific method?
200
Converting nitrate to nitrogen gas.
What is denitrification?
200
Hydrogen sulfide gas can be created in this type of environment, where's the oxygen?
What is anaerobic?
200
Excess phosphorus in lake systems can lead too this overnutrified state.
What is eutrophication?
200
Liquids with a pH of less than 4 are said to be this.
What is acidic?
300
A change in a certain direction provides information that causes a system to change further in the same direction.
What is a positive feedback loop?
300
This ion is produced as a result of nitrogen fixation.
What is ammonium?
300
Burning this sulfur rich non-renewable resource for electricity production, puts about two-thirds of the human input of sulfur dioxide into the atmosphere.
What is coal or oil?
300
Phosphorus is typically found as these salts, located in terrestrial rock formations and ocean bottom sediments.
What are phosphate salts?
300
Substances with high pH's are said to be this. Seems basic to me.
What is alkaline?
400
This occurs when two or more processes interact so the combined effect is greater than the sum of their separate effects.
What is a synergistic reaction?
400
From ammonium to nitrate?
What is nitrification?
400
Most of the earth's sulfur is stored underground in rocks and minerals, including these salts, buried deep under ocean sediments.
What is sulfate salts?
400
On a short human time scale most phosphorus flows one way from the land to this location.
What is the ocean?
400
A liquid with a pH of 3 is this many times more acidic than a liquid with a pH of 5.
What is 100?
500
Chlorofluorocarbons, carbohydrates, and hydrocarbons are all considered this type of compound.
What is organic?
500
This group of plants have abundant nodules on their roots, containing nitrogen fixing bacteria.
What are legumes?
500
Certain marine algae produce large amounts of this, code name DMS.
What is dimethyl sulfide?
500
Dracula may be angry when he finds out that humans are stealing this precious resource from his bat cave.
What is guano?
500
A liquid with a pH of 8 is said to be this many times more basic than a liquid with a pH of 4.