The chlorite and epidote make greenstones green. Gullies hold water for brief periods of time after a rain storm or snow melt. The time required for one-half of the atoms of a radioactive substance to decay. . A measure of a mineral's resistance to scratching. The hardness of a mineral is measured by scratching it against another substance of known hardness.
Headlands are projections of land that stick out into a sea or lake. .
Holocene An epoch of the Quaternary Period beginning 10,000 years ago and continuing today. . An elongate block of rock uplifted along roughly parallel faults . Generally with abundant plagioclase feldspar as well. Grades into amphibolite . From the German, meaning horn rock.