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Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.

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Unit 4: Earth’s Unit 4: Earth’s Crust Crust Ch 7, 8, 9 Ch 7, 8, 9
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Page 1: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.

Unit 4: Earth’s CrustUnit 4: Earth’s Crust

Ch 7, 8, 9Ch 7, 8, 9

Page 2: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.

Chapter 7Chapter 7

7.3 Families of Rocks

Page 3: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.

VocabularyVocabulary

• Magma• Igneous rock• Intrusive• Lava• Extrusive• Sediment• Sedimentary rock• Metamorphic rock

Page 4: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.

• Geologists classify rocks into 3 families based on how they are formed:

1. Igneous

2. Sedimentary

3. metamorphic

Page 5: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.

1.1. Igneous RocksIgneous Rocks• Hot molten rock escapes to cracks in Earth’s

crust = magma

• Hardened magma = igneous rock

• If magma gets to Earth’s surface = lava

Page 6: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.

There are 2 types of Igneous There are 2 types of Igneous rock which depend on how rock which depend on how

fast the magma or lava coolsfast the magma or lava cools

Page 7: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.

If hardens slowly underground If hardens slowly underground (magma) = intrusive igneous rock (magma) = intrusive igneous rock

(granite/large crystals)(granite/large crystals)

Page 8: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.
Page 9: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.
Page 10: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.

If hardens quickly above ground If hardens quickly above ground (lava) = extrusive igneous rock (lava) = extrusive igneous rock

(basalt/ obsidian/pumice)(basalt/ obsidian/pumice)

Page 11: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.
Page 12: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.
Page 13: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.

2. Sedimentary2. Sedimentary

• Sediment = rock particles, clay, mud, sand, gravel and boulders

• Sediment forms layers, pressure builds, deposits compact/cement together = sedimentary rock (fossils!)

Page 14: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.
Page 15: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.
Page 16: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.

Sandstone (sand), shale (clay, silt), Sandstone (sand), shale (clay, silt), conglomerates (pebbles/ small conglomerates (pebbles/ small

stones)stones)

Page 17: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.

3. Metamorphic3. Metamorphic

• Buried igneous or sedimentary rock= high temperature and pressure

• Causes the rocks properties to change

Page 18: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.
Page 19: Unit 4: Earth’s Crust Ch 7, 8, 9. Chapter 7 7.3 Families of Rocks.

The Rock video’sThe Rock video’s

• Rock song

• http://www.youtube.com/watch?v=i81eVDgvKas

• Tim and Moby

• http://www.youtube.com/watch?v=OxMz441UiaY&feature=related


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