A. Penck
A’KF diagram Quick reference
A Dictionary of Geology and Earth Sciences (5 ed.)
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 Quick reference
A Dictionary of Geology and Earth Sciences (5 ed.)
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 Quick reference
A Dictionary of Geology and Earth Sciences (5 ed.)
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-tents Quick reference
A Dictionary of Geography (6 ed.)
A-train Quick reference
A Dictionary of Geology and Earth Sciences (5 ed.)
A series of Earth-observing satellites operated by NASA and other national space agencies. All the satellites are in *polar orbit...
aa Quick reference
A Dictionary of Environment and Conservation (3 ed.)
Volcanic **lava rock that is thick and porous and has a rough, jagged surface when it cools. It
Aalenian Quick reference
A Dictionary of Geology and Earth Sciences (5 ed.)
A *stage in the European Middle *Jurassic (175.6–171.6 Ma ago, Int. Commission on Stratigraphy, 2004). See also...
Aalenian
Aalto-1 Quick reference
A Dictionary of Geology and Earth Sciences (5 ed.)
A student project at the University of Aalto, Finland, in which students built an Earth-observation *nanosatellite based on *...
