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fractional cloud cover

fractional cloud cover  

The relative amount of cloud cover at site, usually expressed in amounts from 0 to 1 in increments of 0.1.
meiobenthos

meiobenthos  

Organisms of the benthos which are between 0.1 and 0.5 millimetres in size. Contrast macrobenthos, microbenthos.
phi scale

phi scale  

The expression of grain sizes on a logarithmic scale. The phi value (ϕ) is related to grain diameter (d) by the expression ϕ = -log2d. Increasing positive phi values are for grain diameters ...
Class I Substance

Class I Substance  

One of several groups of chemicals that have a global warming potential of 0.2 or higher, including chlorofluorocarbons and halons.
Class II Substance

Class II Substance  

A substance that has a global warming potential of less than 0.2, including hydrofluorocarbons.
macrobenthos

macrobenthos  

The larger organisms of the benthos, generally longer than 0.5 millimetres. Contrast meiobenthos, microbenthos.
microbenthos

microbenthos  

The smaller organisms of the benthos, generally shorter than 0.1 millimetres. Contrast macrobenthos, meiobenthos.
non-compliance coal

non-compliance coal  

A North American term for any coal that emits a relatively large amount of sulphur dioxide (greater than 3.0 pounds per million Btu) when burned. Also known as high sulphur coal.
fresh water

fresh water  

Water containing little or no chlorine. According to the Venice system, which classifies brackish waters by their percentage chlorine content, fresh water contains 0.03 per cent or less of chlorine. ...
freeze

freeze  

1 To pass from the liquid to the solid state, known technically as undergoing a phase transition; the opposite of melt or fuse. Although it applies to any material, in meteorology it is nearly always ...
north

north  

The compass point that is at 0° or 360°.
water cycle

water cycle  

The continuous natural cycling of water from the atmosphere to the land and oceans and back. The basic structure of the global water cycle is quite simple. Water is evaporated from the oceans, seas, ...
cobble

cobble  

A rock or particle of sediment that has a particle size between 64 and 256 millimetres (–6.0 to –8.0 on the phi (φ) scale).
deciduous forest

deciduous forest  

In the cold season of temperate latitudes, a tree's water supply is restricted when the temperature falls below 0 °C. To lessen water loss, deciduous trees shed their leaves until the spring brings ...
ozone-depleting potential

ozone-depleting potential  

(ODP)A measure of the capacity of a substance to deplete atmospheric ozone. It is measured relative to the chlorofluorocarbon trichlorofluoromethane (CFC-11), which is assigned an arbitrary ODP value ...
metric ton

metric ton  

A unit of mass equal to 1000 kg or 2204.61 lb. 1 tonne = 0.9842 ton.
scientific notation

scientific notation  

A method of writing numbers in terms of powers of ten. For example the number 0.000118 would be represented as 1.18 × 10-4 or 1.18E−04 where E stands for exponent, as in the exponent that ten is ...
Greenwich Meridian

Greenwich Meridian  

The line of 0° longitude that passes through the Old Royal Observatory at Greenwich, London. It was adopted in 1884 as the prime meridian, and still serves as the reference point for the world's ...
calcareous

calcareous  

1 A substance that is composed of, or contains, calcium carbonate, which typically causes an alkaline condition (pH greater than 7.0).2 A species that accumulates calcium carbonate in its tissues.
acid mine drainage

acid mine drainage  

The drainage of water from areas that have been mined for coal or other mineral ores (including gold, silver, copper, iron, zinc, and lead). The water has high acidity (low pH, sometimes less than ...

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