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.
Best Answer: Igneous rocks are formed when magma (or molten rocks) have cooled down and solidified. Sedimentary rocks are formed by the accumulation of other eroded substances. Metamorphic rocks are formed when rocks change their original shape and form due to intene heat or pressure.Igneous rocks are commonly found inside the Earthâs crust or mantle.Sedimentary rocks are usually found in water bodies. Metamorphic rocks are found on the Earthâs surface.edimentary rocks are formed by the accumulation of other eroded substances. Metamorphic rocks are formed when rocks change their original shape and form due to intene heat or pressure.