A geologist who analyses samples from an oil well as it is being drilled and reports on hydrocarbon content etc.

plural of geologic era

(geology, Paleontology) A subdivision of geologic time that divides an eon into smaller timeframes.

(geology) The fine-grained background material in which crystals, pebbles or fossils are embedded in a sedimentary rock

Of or pertaining to geomagnetism.

(chemistry) The branch of chemistry that deals with the chemical composition of the Earth and other planets, and with the chemical processes that occur in the formation of rocks and minerals etc.

The study of the effects of geography (especially economic geography) on international politics.

Of or pertaining to geophysics.

(geology, physics) A physicist who specialises in geophysics.

The point located at 90 degrees latitude north. The magnetic North Pole (where compasses point) may vary from where the Geographic north pole is.