Earth Science: Chapter 2: lesson 2 Rocks

Rocks Chapter 2, Lesson 2

Rocks

• A rock is a natural, solid mixture of particles mainly made of individual mineral crystals, broken bits of minerals, or fragments of rock.

Igneous Rock

• Magma deep in Earth cools slow– large crystals

• Lava on Earth’s surface cools fast– small crystals

Metamorphic Rock

• Formed when solid rocks are squeezed (pressure) or heated. – New rock forms from old rock– Foliation- parallel bands of minerals form.

Sedimentary Rocks

• Formed when sediment (small pieces of rock) is compressed by the weight of the material above them.

Rock Cycle

Homework

• Chapter Content Mastery: Rocks and Minerals handout