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The prefix radio as in radiometric dating means

Angstrom: (Å), a unit of length equal to 10 centimeter.

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The continental crustal flux has not been directly measured on the surface and its migration pathways to the atmosphere are poorly understood.The word andesite is derived from the Andes Mountains, located along the western edge of South America, where andesite rock is common.Angrite: A type of achondrite meteorite consisting of pyroxene, olivine, and plagioclase.Anorthosite: An igneous rock made up almost entirely of plagioclase feldspar. ANSMET: (The Antarctic Search for Meteorites) An exploration program to collect meteorites in Antarctica supported by grants from the Office of Polar Programs of the U. [ ANSMET website ] Antenna: A conductor by which electromagnetic waves are transmitted or received.Antipode: A point on the surface of a sphere that is located diametrically opposite another point.After formation, bodies are said to have "accreted" from small objects.

Achondrite: A class of stony meteorites that crystallized from magmas. AGB stars: Cool, luminous, and pulsating red giant stars.

From oldest to youngest, these are Noachian, Hesperian, and Amazonian (named after places on Mars).

These Epochs are defined by the number of impact craters on the ground surface; older surfaces have more craters.

Ammonia: A gas molecule composed of one part nitrogen and three parts hydrogen; NH).

Andesite consists mainly of plagioclase and one or more mafic minerals.

The Amazonian Epoch extends from about 2.9-3.3 billion years ago to the present day.