Rocks are hard pieces of the earth's surface.

A rock is made up of different minerals. ​

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ROCKS

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Rocks are classified by how they are formed. ​

Rocks come in many shapes and sizes.

​Three groups of rocks

• ​Forms when hot, melted rock cools.

• The melted rock comes from the deep in earth.

• A volcano is an opening that allows melted rock to come to the surface.

• The melted rock cools and hardens.​

IGNEOUS ROCK

Examples:

Obsidian and Granite

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• ​Is smooth that it looks like glass.

OBSIDIAN

• It is often speckled, has shiny crystal spots, has a rough surface.​

GRANITE

​Mount Rushmore is a famous granite mountain in South Dakota. Huge faces of four United States presidents have been carved in the side of this mountain.

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Did you know?

It is form when layers of sediment are pressed together and harden.

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It has a striped look.

​Sedimentary Rock

​It forms from the shells and bones of sea animals. The shells and bones break apart after the animal die. When pressed together, the bits os shell and bone form limestone.

​​Limestone

​This is a rock that is made when layers of sand get pressed together.

Sandstone

​Examples of Sedimentary rocks

• Sometimes fossils are found in sedimentary rock.

• A fossil is any part or mark of a living thing that is naturally preserved after it dies.​

Fossil

​metamorphosis- "to change"

• Forms when igneous or sedimentary rocks are changed by great heat and pressure.​

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Metamorphic Rock

• Rocks are classified on how they are formed.

• Obsidian and granite are igneous rock. Limestone is a sedimentary rock. Marble is a metamorphic rock. ​

• Rocks are made of one or more minerals.​

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ROCKS

​WHY IS GOD'S ATTRIBUTE COMPARED TO ROCK?