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

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Presentation transcript:

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

How Igneous Rocks are Formed

Igneous Rocks Intrusive Igneous Rocks Extrusive Igneous Rocks

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

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)

Sedimentary Rocks

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

Metamorphic Rocks