A lymphocyte is a type of white blood cell. White blood cells are part of your immune system and help your body fight off diseases, including infections and cancer. There are two main types of lymphocytes â B cells and T cells. B cells make antibodies that attack bacteria and toxins in the body.
- Mud, sand, and volcanic ash can make sedimentary rocks. bones leaves, stems, and other remains of living things. - Geologists classify metamorphic rocks according to the arrangement of the grains that make up the rock. - Metamorphic that have their grains arranged in parallel layers or bands are said to be foliated.
If the magma cools within the Earth it forms large bodies of crystalline rock called plutons or batholiths. These rocks are called intrusive igneous rocks. Sedimentary rocks are formed in layers deposited by wind, water or ice. The are the product of the process of weathering. As sedimentary layers are buried they are cemented and lithified. Metamorphic rocks are rocks formed by the action of pressure, temperature and fluids within the Earth. As sediments are deeply buried they are deformed and new minerals recrystallize at the elevated temperatures and pressures to form metamorphic rocks.