The Rock Cycle Weathering and erosion, which are external processes, produce the sediment from which sedimentary rocks form.

Igneous Rock DID YOU KNOW? Igneous is derived from the Latin ignis, meaning fire. Most of the seafloor is made of Basalt an EXTRUSIVE (Volcanic) IGNEOUS ROCK

Igneous – Formed from the cooling of molten rock

Igneous Rock Intrusive- IR that form from the cooling of magma inside the Earth. LARGE CRYSTALS=SLOW COOLING Extrusive-IR that form at the Earth’s Surface. SMALL CRYSTALS=FAST COOLING

Lava Extrusive Lava Lava Intrusive Magma

Sedimentary Rocks

Sedimentary Rocks DID YOU KNOW? 75% of rocks exposed at Earths surface are sedimentary Sedimentary rocks form in various regions oceans, lakes, rivers, beaches glaciated areas deserts

Sedimentary Rock Sedimentary – Formed in layers as a result of pressure on sediments (small pieces of rock)

Sedimentary Rocks Form By Three Main Processes Compaction- Sediments get compressed and compacted. Cementation-Small crystals precipitate and act as glue that holds the rock together. Precipitation-Crystals precipitate directly from solution.

Metamorphic Rocks

Metamorphic Rocks DID YOU KNOW? Metamorphism means of changed form Metamorphic rocks form under high temperature and pressure

Metamorphic – Formed from older “parent rock” (either igneous or sedimentary) under intense heat and/or pressure far beneath the earth’s surface.

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