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.
clastic rock - (geology) a rock composed of broken pieces of older rocks. geology-a science that deals with the history of the earth as recorded in rocks.clast - (geology) a constituent fragment of a clastic rock.rock, stone-a lump or mass of hard consolidated mineral matter; he threw a rock at me.lastic rock - (geology) a rock composed of broken pieces of older rocks. geology-a science that deals with the history of the earth as recorded in rocks. clast - (geology) a constituent fragment of a clastic rock. rock, stone-a lump or mass of hard consolidated mineral matter; he threw a rock at me.