Natural environment

Natural environment

Related to any physical feature of the earth's natural environment.

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refractor

Astronomy; General astronomy

A telescope that uses as its primary optical element a lens. Binoculars are a type of refractor. In general, refractors are much more expensive to build and buy than are ...

binomial nomenclature

Biology; Genetics

A method of identifying and naming organisms using two names. The first name is the genus name, and the second is the species name. Names are usually Latin or Greek in origin.

securities markets

Financial services; General Finance

Organized exchanges plus over-the-counter markets in which securities are traded.

phase angle

Astronomy; General astronomy

For a solar system object besides the earth and sun, the angle between the earth and the sun (or the earth's elongation from the sun) as seen from that third object. The phase ...

basal group

Biology; Genetics

The earliest diverging group within a clade; for instance, to hypothesize that sponges are basal animals is to suggest that the lineage(s) leading to sponges diverged from the ...