A hydrocarbon deposit, such as petroleum, coal, or natural gas, derived from living matter of a previous geologic time and used for fuel.Search the Web for Nacelle
Clouds of unknown composition that have a soft, pearly luster and that form at altitudes about 25 to 30 km above the earth's surface. They are also called mother-of-pearl clouds.Search the Web for Nacreous Clouds
Natural Products are products made using natural organic ingredients and none factory processes. Often made by small independent local businesses or individuals.Search the Web for Natural Products
A process that results in a reduction in the response of a system to an external influence. For example, increased plant productivity in response to global warming would be a negative feedback on warming, because the additional growth would act as a sink for CO2, reducing the atmospheric CO2 concentration.Search the Web for Negative Feedback
Animals, such as fish and whales, that move independently of water currents between the bottom and surface of the ocean.Search the Web for Nekton
A hydrocarbon deposit, such as petroleum, coal, or natural gas, derived from living matter of a previous geologic time and used for fuel.Search the Web for Net Metering
A dark, gray cloud characterized by more or less continuously falling precipitation. It is not accompanied by lightning, thunder, or hail.Search the Web for Nimbostratus
A compound containing nitrogen that can exist in the atmosphere or as a dissolved gas in water and which can have harmful effects on humans and animals. Nitrates in water can cause severe illness in infants and domestic animals. A plant nutrient and inorganic fertilizer, nitrate is found in septic systems, animal feed lots, agricultural fertilizers, manure, industrial waste waters, sanitary landfills, and garbage dumps.Search the Web for Nitrate
(NTA) A compound now replacing phosphates in detergents.Search the Web for Nitrilotriacetic Acid
Cyclic movement of nitrogen in different chemical forms from the environment, to organisms, and then back to the environment.Search the Web for Nitrogen Cycle
Conversion of atmospheric nitrogen gas into forms useful to plants and other organisms by lightning, bacteria, and blue-green algae; it is part of the nitrogen cycle.Search the Web for Nitrogen Fixation
Process without a simple proportional relation between cause and effect.
The climate system contains many non-linear processes, resulting in a
system with very complex behavior.
Note: Complex systematic behavior does not imply dramatic chaotic behavior; multiple cause and effect processes 'overlap' in their effect - much like waves in a sea, often canceling each other out and creating relative 'calm'. Although every once in a while you will get effects that mutually enhance each other and cause dramatic short or long term lived events or features in the climate (i.e. tornadoes, gulf streams, etc).
Water that is unsafe or unpalatable to drink because it contains pollutants, contaminants, minerals, or infective agents.Search the Web for Non-potable
Sources of pollution that do not originate at the point where pollution is detected, e.g.: agricultural runoff: precipitation and irrigation-related runoff of animal wastes and pesticides from crop and pasture lands. feedlot runoff: primarily precipitation-related discharge of animal wastes from concentrated livestock feeding areas. individual wastewater treatment system runoff: discharge of partially treated sewage from malfunctioning on-site septic systems. urban runoff: precipitation-related discharge of septic leachate, animal wastes, etc. from impervious surfaces, lawns, and other urban land uses. wildlife runoff: precipitation-related runoff of animal wastes from areas with high concentrations of wildlife (e.g., waterfowl).Search the Web for Nonpoint Sources
Null Electricity is electricity that is stripped of its attributes and undifferentiated. No specific rights to claim fuel source or environmental impacts are allowed for null electricity. Also referred to as commodity or system electricity.Search the Web for Null Electricity
The assumption that any observed difference between two samples of a statistical population is purely accidental and not due to systematic causes.Search the Web for Null Hypothesis
Contamination of water resources by excessive inputs of nutrients. In surface waters, excess algal production is a major concern.Search the Web for Nutrient Pollution