 Naturally formed solid that is usually made up of one or more minerals  Minerals combine to form most rocks  Minerals – have a definite chemical makeup  Rocks do not have a crystal structure  Limestone has only one mineral  Obsidian and Coal have no minerals

 Earth is almost all rock  Used for many things  Monuments and sculptures made of  We study to learn how things change

 Rocks change over thousands/millions of years  Never stops – no start or end  Does not have to go in an order

 Forms when molten rock cools and becomes solid  Can form within Earth or on surface  Rocks formed deep underground can come to surface

 Forms when pieces of rocks or other plants/loose material press or cemented together  New minerals can form in spaces where not cemented together  Sediment gets carried by water or wind  Water evaporates leaves behind minerals that dissolve in water

 Forms when heat and/or pressure changes older rocks  Structure of rocks change – new minerals created  Can raise to surface over time

 All three kinds can be found here  95% of entire crust Igneous and Metamorphic  75% of the surface is Sedimentary  Distribution due to rock cycle