A mineral isa naturally ocurring solid in earth´s crust with a definitestructure and composition. All the rocks are formed by two or more minerals.The minerals are classified by his hardness.If a fingernail can scatch a mineral, that mineral is very soft.If a streak plate can scrath a mineral, that mineral is very hard.
The rock cycle is very complex. First, an igneus rock form when hot materials cools down,then, when that rock is destruyed in pieces or cemented together, that is an sedimentary rock, and then, when and sedimentary rock is changed by heat or by pressure, that is an metamorphic rock, that is the rock cycle
No hay comentarios:
Publicar un comentario