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A’KF diagram

A’KF diagram   Quick reference

A Dictionary of Geology and Earth Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2013

A three-component triangular graph that is used to show how metamorphic *mineral assemblages vary as a function of rock composition within one ...

A-layer

A-layer   Quick reference

A Dictionary of Geology and Earth Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2013

The seismic layer corresponding to the *crust of the Earth. It varies in thickness from a few kilometres to 70–90 km. The base lies on the ...

A-subduction

A-subduction   Quick reference

A Dictionary of Geology and Earth Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2013

The movement of one continental lithospheric *plate under another (*subduction) in a *collision zone, with the separation of part or all of the upper ...

A-train

A-train   Quick reference

A Dictionary of Geology and Earth Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2013

A series of Earth-observing satellites operated by NASA and other national space agencies. All the satellites are in *polar orbit...

aa

aa   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

Volcanic **lava rock that is thick and porous and has a rough, jagged surface when it cools. It

Aalenian

Aalenian   Quick reference

A Dictionary of Geology and Earth Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2013

A *stage in the European Middle *Jurassic (175.6–171.6 Ma, Int. Commission on Stratigraphy, 2004). See also dogger...

abandoned channel

abandoned channel   Quick reference

A Dictionary of Geology and Earth Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2013

A former stream channel through which water no longer flows (e.g. a *cut-off).

abandoned well

abandoned well   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

Any *well that has not been used for a long time and/or is not properly sealed, and is so

abandonment facies association

abandonment facies association   Quick reference

A Dictionary of Geology and Earth Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2013

A *facies association formed under conditions of rising sea level, when *clastic deposition has ceased and sediment is deposited very slowly....

abapical

abapical   Quick reference

A Dictionary of Geology and Earth Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2013

A directional term meaning away from the shell *apex.

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