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Igneous Rock Forms when molten rock (magma/lava) cools and hardens Cools slowly beneath Earth’s surface = intrusive Cools rapidly on the surface = extrusive Intrusive rocks usually have large, visible grains Extrusive rocks usually have small to no visible grains Color is based on the amount of silica in the magma
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Igneous Rock Forms when molten rock (magma/lava) cools and hardens Cools slowly beneath Earth’s surface = intrusive Cools rapidly on the surface = extrusive.

Jan 03, 2016

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Rolf Blake
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Page 1: Igneous Rock Forms when molten rock (magma/lava) cools and hardens Cools slowly beneath Earth’s surface = intrusive Cools rapidly on the surface = extrusive.

Igneous Rock• Forms when molten rock (magma/lava) cools and

hardens• Cools slowly beneath Earth’s surface = intrusive• Cools rapidly on the surface = extrusive• Intrusive rocks usually have large, visible grains• Extrusive rocks usually have small to no visible grains• Color is based on the amount of silica in the magma

Page 2: Igneous Rock Forms when molten rock (magma/lava) cools and hardens Cools slowly beneath Earth’s surface = intrusive Cools rapidly on the surface = extrusive.

How Igneous Rocks are Formed

Page 3: Igneous Rock Forms when molten rock (magma/lava) cools and hardens Cools slowly beneath Earth’s surface = intrusive Cools rapidly on the surface = extrusive.

Igneous Rocks

Intrusive Igneous Rocks Extrusive Igneous Rocks

Page 4: Igneous Rock Forms when molten rock (magma/lava) cools and hardens Cools slowly beneath Earth’s surface = intrusive Cools rapidly on the surface = extrusive.

Sedimentary Rocks

• Forms from the compaction and cementation of rock pieces, mineral grains, or organic matter called sediments

• Can contain fossils• Sediments are formed through the process of

weathering and erosion of exposed rocks.• Strata are layers of rock, or sometimes soil

Page 5: Igneous Rock Forms when molten rock (magma/lava) cools and hardens Cools slowly beneath Earth’s surface = intrusive Cools rapidly on the surface = extrusive.

3 kinds:–Clastic = made of mineral or rock pieces

(shale; conglomerate; sandstone; Breccia)–Organic = made from plant or animal

remains (coal; coquina; some limestones)–Chemical = made from dissolved minerals in

water (halite; other limestones)

Page 6: Igneous Rock Forms when molten rock (magma/lava) cools and hardens Cools slowly beneath Earth’s surface = intrusive Cools rapidly on the surface = extrusive.

Sedimentary Rocks

Page 7: Igneous Rock Forms when molten rock (magma/lava) cools and hardens Cools slowly beneath Earth’s surface = intrusive Cools rapidly on the surface = extrusive.

Metamorphic Rock

• Forms when rocks are changed into different kinds of rocks by great heat and pressure

• They are heated, squeezed, folded, or changed by contact with hot magma.

• 2 kinds:– foliated = grains are in bands– nonfoliated = no banding

Page 8: Igneous Rock Forms when molten rock (magma/lava) cools and hardens Cools slowly beneath Earth’s surface = intrusive Cools rapidly on the surface = extrusive.

Metamorphic Rocks