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, Sedimentary, and Metamorphic Rocks. The three types of rocks igneous, sedimentary, and metamorphic are all subject to processes that change one rock type into another. The images below show several types of rocks undergoing these processes.Just as evaporation and precipitation are processes that move water through the water cycle, igneous, sedimentary, and metamorphic rock-forming processes move rocks through the rock cycle.In this investigation, you ll examine a detailed example of a rock traveling through the rock cycle.he three types of rocks igneous, sedimentary, and metamorphic are all subject to processes that change one rock type into another.