Ch. 9Ch. 9Lesson 6Lesson 6

How are rocks How are rocks classified?classified?

3 types of rocks

igneous metamorphicsedimentary

igneous

forms when melted rock cools

& hardens

cools slowly large crystals

cools quickly small crystals

examples:

Basalt

Granite

Pumice

igneous rock at Sunset Crater, Arizona

sedimentary

form when layers of

materials & rock particles

settle on top of each other& harden

plant & animalfossils

examples:sandstone

conglomerate

Rock layers are put down in the order in which they were formed.

Rock layers are put down in the order in which they were formed.

sedimentary rock at Bryce Canyon, Utah

metamorphic

formed whenexisting rock squeezed &

heated @ high temp.

examples:gneissslate

metamorphic rock at the bottom of the Grand Canyon

metamorphic rocks

The more you try to be gneiss, the more you get taken for granite.

rock cycle

• how rocks change from 1 kind into another

Interactive Rock Cycle Game

Interactive Rock Cycle animation

• SEDIMENTARY rock Has been formed in layers Often found near water sources With fossils from decayers

• Then there's IGNEOUS rock Here since Earth was born Molten lava, cooled and hardened That's how it is formed

• These two types of rocks Can also be transformed With pressure, heat and chemicals

METAMORPHIC will be formed. ( Don't forget to sing this as a "Round"; after all, it is the Rock "Cycle"! )

Rock Cycle Song

(Sing to the tune of

"Row, Row, Row Your

Boat")

Rock Cycle ActivitySugar cube before

Type of rock

Sedimentary

Metamorphic or igneous

Observations

Hard cube

Sugar cube during

Shook it-became chipped

Changed shape-round

Bubbly & oily-yellow & brown

Became liquid

Sugar cube at end

Procedure:

1. Fold up the sides of the aluminum foil square to make a small tray.

2. Pour the sugar sediment onto the tray.

3. Describe the appearance of the sugar in your data table.

4. Secure the candle on your table in a lump of clay.

5. Predict what you think will happen if you heat the sugar. Record your prediction.

6. Use tongs to hold the tray. Heat the sugar slowly by moving the tray gently back and forth over the flame. Make observations while the sugar is heating.

7. When you think there is no longer a chemical reaction occurring, blow out the candle.

8. Allow the tray to cool for a few seconds and set it down on your desk. Record your observations of the material left in the tray.