Earth science

Earth science

Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.

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Earth science > Mapping science

Bowie's gravity table

Earth science; Mapping science

One of a set of tables calculated by W. Bowie (1917) giving combined topographic and isostatic gravity corrections, according to the Pratt Hayford theory of isostatic ...

butterfly shutter

Earth science; Mapping science

A shutter shaped like a filled in figure 8 and rotating about a pivot through the waist of the figure in such a way that light passing through the system can be interrupted by one ...

Bessel's formulae

Earth science; Mapping science

The formulae for the standard deviation s of a set of N numbers and the standard deviation s a of the average: s = √ ( Σ v²/(N 1)) and s a = √ ( Σ v²/(N 1)N). The v's ...

calibration correction

Earth science; Mapping science

(1) The value to be added to or subtracted from the reading of an instrument to obtain the correct reading. (2) The correction, to the nominal length between two graduations on ...

Boussinesq approximation

Earth science; Mapping science

(1) An approximation (Boussinesq 1903), to the exact equations of motion of water, which neglects, in the inertial term, variations in the density of water. (2) An approximation ...

clock rate

Earth science; Mapping science

The rate of change of a clock correction; the amount gained or lost by a clock in a unit of time. When applied to a chronometer, the quantity is called chronometer rate. Clock ...