Medical Definition of amnesia. 1: loss of memory sometimes including the memory of personal identity due to brain injury, shock, fatigue, repression, or illness or sometimes induced by anesthesia a period of amnesia after the wreck.
Shale is a fine-grained sedimentary rock that forms from the compaction of silt and clay-size mineral particles that we commonly call mud. This composition places shale in a category of sedimentary rocks known as mudstones.
IGNEOUS ROCKS are formed from the solidification of molten rock. Most of the Earth is composed of igneous rock. There are 2 major types of igneous rocks; intrusive igneous rocks, and extrusive igneous rocks.INTRUSIVE IGNEOUS ROCKS solidify beneath the Earth's surface.Because the magma cools over a relatively long period of time, Intrusive igneous rocks tend to have large mineral crystals that give the rock a rough granular texture.NTRUSIVE IGNEOUS ROCKS solidify beneath the Earth's surface. Because the magma cools over a relatively long period of time, Intrusive igneous rocks tend to have large mineral crystals that give the rock a rough granular texture.