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What is the The rock cycle is the series of processes in which a rock forms, changes from one type to another, is destroyed, and forms again by geological.

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Presentation on theme: "What is the The rock cycle is the series of processes in which a rock forms, changes from one type to another, is destroyed, and forms again by geological."— Presentation transcript:

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2 What is the The rock cycle is the series of processes in which a rock forms, changes from one type to another, is destroyed, and forms again by geological processes. Rock Cycle?

3 Sedimentary Chert Metamorphic Gneiss Igneous Basalt The Three Main types of Rocks

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5 RocksNatural Processes Rock Cycle Rocks and Natural Processes make up the Rock Cycle weathering melting pressure, heat Sedimentary Metamorphic Igneous

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7 First rocks were igneous. All other rocks formed from them

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9 Igneous rocks are rocks that form when molten material cools and solidifies.

10 General characteristics of magma: Rocks formed from lava are EXTRUSIVE Rocks formed from magma are INTRUSIVE

11 General characteristics of magma: Texture: Texture refers to the size and shape of the crystals that make up the rock. Fine Grained Texture: Fast cooling rock. Mineral crystals do not have much time to form. Coarse Grained Texture: Slow cooling rock. Mineral crystals have time to form.

12 Composition: Light-colored igneous rocks: High in silicon Lower density. Ex. Granite, Rhyolite Dark-colored igneous rocks: High in calcium, iron, and magnesium. LOW in silicon Higher density Ex. Gabbro, Basalt

13 Textures Coarse-grained (Intrusive) Diorite GraniteGabbro Pegmatite

14 2 inches PegmatitePegmatite

15 DioriteDiorite

16 GabbroGabbro

17 GraniteGranite

18 Textures Fine-grained (Extrusive) BasaltObsidian RhyoliteAndesite

19 2 inches BasaltBasalt

20 RhyoliteRhyolite

21 AndesiteAndesite

22 ObsidianObsidian

23 Intrusive Igneous Rock: Forms from magmaForms from magma Forms below the surfaceForms below the surface Slow coolingSlow cooling Usually coarse-grained (large crystals)Usually coarse-grained (large crystals)

24 Extrusive Igneous Rock: Forms from lavaForms from lava Forms above the surfaceForms above the surface Fast coolingFast cooling Usually fine-grained (small crystals)Usually fine-grained (small crystals)

25 Slow cooling, large crystals Quick cooling, small crystals

26 Most of the ocean floor is composed of basalt. Basalt is extrusive and fine-grained

27 Future extrusive igneous rock

28 Half Dome, Yosemite National Park Granite…Intrusive??

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30 Tectonic forces like converging plates can cause plates or sometimes regions to uplift. Forces of erosion such as rain, wind, and glaciers can wear away layers of softer sedimentary rock exposing the underlying igneous rock

31 Devils Tower Volcanic neck Wyoming

32 Mt. Rushmore Granite (Intrusive Granite (Intrusive) (Uplift)

33 Lesser known (but equally impressive) rear view of Mt. Rushmore

34 Common uses for igneous rocks

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