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 metamorphic rock is an igneous, sedimentary, or ano â¦ ther metamorphic rock that has either been squeezed by incredible pressures deep underground and/or has been exposed to very high temperatures, altering its structure, mineral alignment, mineralogy, and possibly its chemistry. 3 people found this useful.ituminous coal is a sedimentary rock. Anthracite coal is considered a metamorphic rock. 5 people found this useful. Edit. Share to: 1  The Periodic Table of Elements Life is sustained by a number of chemical elements.