1. The Rock Cycle What is a rock?

2. Answer A naturally occurring solid mixture of 1 or more minerals/organic matter Rocks are always changing New rocks form from old rocks = ROCK CYCLE

3. How can rocks help Humans? HMMMMMMM…

4. Human Usage of Rocks Used for tools – Hammers, knives, arrowheads, spear points, scrapers Roads + monuments – Pyramids, capitol buildings

5. Weathering IS H2O, wind, ice, and heat break down rock Breaks rocks down into fragments These fragments will become part of sedimentary rocks

6. Erosion Sediment is removed from its source This is caused by H2O, wind, ice, + gravity

7. Deposition Process in which sediment moved by erosion is dropped and comes to rest is this. Sediment is deposited in bodies of water or areas of low-lying land Sediment will be pressed and cemented together to form sedimentary rock

8. Example of this Bryce Canyon is an example of weathering, erosion, and deposition

9. Heat and Pressure Sedimentary rock can also form when sediment is buried and squeezed by weight IF add heat to the process then the sediment rock can change to metamorphic rock If HOT enough to melt then will create magma when MAGMA cools then have igneous rock

10. Uplift Buried rock will eventually be exposed to Earth due to uplift and erosion Uplift is movement within the Earth that causes rocks inside the Earth to be moved to the surface Uplifted rocks will then go through weathering, erosion, and deposition

12. Rock cycle steps/paths 1.sedimentary rock -grains of sand and other sediments erode from hills and Mts—wash into rivers—oceans—form the ocean floor—compacted together to form this

13. 2. Metamorphic rock -Earth’s crust collide (tectonic plates) some rock is forced downward—get intense heat + pressure= m. Rock

14. 3. Magma -Hot Liquid forms when rock is melted

15. 4. Igneous Rock -Magma rises (is less dense), cools= I. rock

16. 5. Sediment -Uplift and Erosion expose the Igneous Rock—weathers, wears back into Sedimentary rock

18. Rocks changing So rocks are continually changing what time they’re due to the Earth’s process – Igneous –Sedimentary-Metamorphic The location of the rock is a huge factor is what the rock will change into – Surface- have weathering, erosion, deposition – Deep down- heat and pressure

19. Rock Classification Rocks are first divided into igneous, metamorphic, and sedimentary by how they form But then will divided them down even farther – Ex. Igneous- if cooled on Earth’s surface or below 2 main items scientist use is the composition and texture of rock to identify them

20. Composition Minerals that make up the rock Look @ pg. 95

21. Texture The size, shape, and position of the grains that make up the rock = texture of it – Sedimentary= fine-medium, or coarse- depends on size of grains – Igneous= fine to coarse-depends on how time magma has to cool – Metamorphic = fine or coarse- depends on temperature and pressure rock gets – Texture can also tell how rock was formed-look on pg. 96