forensic pathology - the branch of medical science that uses medical knowledge for legal purposes; forensic pathology provided the evidence that convicted the murderer. forensic medicine. medical specialty, medicine - the branches of medical science that deal with nonsurgical techniques.
There are three major groups of rock: Igneous; Sedimentary; Metamorphic. They are all related through a continuous cycle called the rock cycle. Igneous rocks are created by melting and crystallization of molten material called magma. If the magma reaches the surface, the rocks are said to be extrusive. Volcanic lava flows are examples of extrusive igneous rocks.
Igneous Rocks. Igneous rocks form when molten rock cools and becomes solid. Molten rock is called magma when it is below the Earth s surface and lava when it is above. Igneous rocks are divided into two groups, based on where the rock forms.