Absolute Age

Hoike on February 4, 2013

in geology, an age given in numbers as opposed to an age expressed relative to other geological formations (A1)

Abiogenic

Hoike on February 4, 2013

from a nonliving source, as sand that comes from rock (C1)

aa

Hoike on February 4, 2013

lava that has a rough, spiny, or rubbly surface (A1)