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.
All rocks are made of minerals. Igneous rocks are formed from molten and magma eg. basalt and granite, Sedimentary rocks are mechanically or organically formed eg. sandstone, â¦ limestone and shale and Metamorphic rocks are formed from igneous or sedimentary rocks altered by heat or pressure eg. slate and graphite.n igneous rock is a rock that is made from heat, and the different types of igneous rocks are Obsidian, Granite, Basalt, Pumice and Gabbro.