a deep, narrow hole made
in the ground, especially to
locate water or oil.
A narrow tube that digs
deep to collect a rock
sample of the ground
beneath
Geochemical
Analysis
Geochemical analysis can predict where
petroleum, metals, water, and
commercially valuable minerals can be
located—a branch of the science known
as geochemical prospecting.
Magnetic
Survey
Magnetic surveys record spatial
variation in the Earth's magnetic field.
In archaeology, magnetic surveys are
used to detect and map archaeological
artefacts and features.
An aeromagnetic survey is a
common type of geophysical survey
carried out using a magnetometer
aboard or towed behind an aircraft.
The principle is similar to a magnetic survey
carried out with a hand-held magnetometer,
but allows much larger areas of the Earth's
surface to be covered quickly for regional
reconnaissance.
The aircraft typically flies in a grid-like pattern with height
and line spacing determining the resolution of the data
(and cost of the survey per unit area).