BELLWORK • You found a mineral that can scratch quartz but can be scratched by corundum. What mineral do you possibly have?
ESSENTIAL QUESTION • How are rocks formed and classified?
Vocabulary • Rock cycle • the series of processes in which a rock forms, changes from one type to another, is destroyed and forms again by geological processes. • Rock • a naturally occurring solid mixture of one or more minerals or organic matter. • Erosion • The process by which wind, water, ice, or gravity transports soil and sediment from one location to another.
Vocabulary • Deposition • The process in which material is laid down. • Composition • The chemical makeup of a rock; describes either the minerals or other materials in the rock. • Texture • The quality of a rock that is based on the sizes, shapes and positions of the rock’s grains. Texture Fine-grained Siltstone Medium-grained Sandstone Coarse-grained Conglomerate
The Rock Cycle Weathering and Erosion Compaction and Cementation Heat and Pressure Melting Cooling
Classification of Rocks • Rocks are classified 2 ways: • Composition – what the rock is made of • Texture – The size and shape of the grains
QUIZ • How are rocks classified (2 ways)? • Name 3 things that can happen to a rock during the rock cycle.