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Introduction to Rocks

Introduction to Rocks

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Introduction to Rocks

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  1. Introduction to Rocks Geology Unit 2

  2. What are Rocks? • Rocks are simply aggregates (combinations) of one or more minerals. • Rocks can be hard or soft, vary in size. • Integral part of human history • First tools were made of stone • Shelter • Monuments, etc. • The study of rocks is the science of petrology.

  3. Rock system of classification • There are many types of rocks, geologists classify rocks based on HOW the rocks were formed. • There are three categories of rocks: • 1. Igneous • 2. Sedimentary • 3. Metamorphic

  4. Igneous Rock • How do they form? • Forms directly from liquid rock (magma). • Liquid rock cools and hardens to form Igneous rock. • Liquid rock inside the earth is Molten magma • Liquid rock that exits onto the earth’s surface is known as lava.

  5. Examples of Igneous Rock Source: http://www.geog.ucsb.edu/~dylan/mtpe/geosphere/topics/rx/igneous.html

  6. Sedimentary Rock • Result from pre-existing rock • Sedimentary Rock = layered rock. • Rocks break down into pieces due to environmental forces (wind, water, ice)….more on this later  • Pressure (due to weight of sediments) solidify these rock particles together. This happens continuously, forming layered rock.

  7. Examples of Sedimentary Rock • Gros Morne National Park, Newfoundland

  8. Examples of Sedimentary Rock • Parrsboro, Nova Scotia

  9. Examples of Sedimentary Rock… • Hopewell Rocks, NB

  10. Examples of Sedimentary Rock.. Source: http://www.geog.ucsb.edu/~dylan/mtpe/geosphere/topics/rx/sedimentary.html

  11. Metamorphic Rock • Form from pre-existing igneous & sedimentary rocks • High temperatures & pressure cause the pre-existing rock to become physically or chemically altered. • Pre-existing rock becomes warped, deformed, compressed/compacted into a smaller volume of space. • They become more dense • Metamorphic rocks are less susceptible to erosion.

  12. Examples of Metamorphic Rock… Source: http://www.geog.ucsb.edu/~dylan/mtpe/geosphere/topics/rx/metamorphic.html

  13. Your Task • Become familiar with the three types of rocks, their characteristics and how we can identify them. • How? by completing worksheets and visiting my website. • Igneous Rocks • Sedimentary Rocks • Metamorphic Rocks