Rocks and The Rock Cycle Three Types of

Rocks and The Rock Cycle

Three Types of Rocks • Igneous • Sedimentary • Metamorphic

Igneous Rocks Formed when molted rock (lava or magma) cools and hardens Two types of Igneous Rocks Intrusive : cooled slowly beneath the surface, contains large crystals Extrusive: cooled rapidly on the surface, contains small crystals

Intrusive ? Extrusive

Sedimentary Rocks 1 st the rocks are weathered and eroded by wind and water (This means the rock is broken down into little particles called sediment. The sediment is then carried away by wind and water. )

Sedimentary Rocks 2 nd the sediment is deposited in layers (This means the sediment is dropped. Over time this forms layers of different sediment. )

Sedimentary Rocks 3 rd the layers are compacted and cemented together forming sedimentary rock. (This means the sediment is squeezed and glued together. )

Sedimentary Rocks

Metamorphic Rocks Formed when rocks undergo a structural change due to Heat and Pressure

The Rock Cycle

Quick Check 1. Metamorphic Rock is rock whose structure has changed. What factors change the rock? A. heat and pressure B. compaction and cementation C. cooling of magma

Quick Check 2. An active volcano on a Pacific island spews out lava. When it cools, what has been formed? A. metamorphic rock B. sedimentary rock C. igneous rock

Quick Check 3. What type of igneous rock is shown below? A. Intrusive B. Extrusive C. Sedimentary WHY? ? ?

Quick Check 4. What is the correct order of steps that form sedimentary rock? A. compaction & cementation, weathering & erosion, deposition B. weathering & erosion, deposition, compaction & cementation C. deposition, compaction & cementation, weather & erosion

Quick Check 5. Where does magma or lava come from? Molten or “melted” rock