What's an account? When a computer is used by many people it is usually necessary to differentiate between the users, for example, so that their private files can be kept private. This is important even if the computer can only be used by a single person at a time, as with most microcomputers. Thus, each user is given a unique username, and that name is used to log in. There's more to a user than just a name, however. An account is all the files, resources, and information belonging to one user.
They include biochemical, clastic and evaporative sedimentary rocks. Biochemical sedimentary rocks are formed from organic processes that involve living organisms producing the sediments. These living organisms can be snails and clams whose discarded calcium carbonate shells can form limestone.
A particle of mineral or other rock that gives a rock texture. IGNEOUS ROCK. A type of rock that forms from the cooling of molten rock at or below the surface. SEDIMENTARY ROCK. A type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together. METAMORPHIC ROCK. A type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reactions.