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Rocks Classifying Rocks Igneous Rocks Sedimentary Rocks Rocks from Reefs Metamorphic Rocks The Rock Cycle Table of Contents.

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Presentation on theme: "Rocks Classifying Rocks Igneous Rocks Sedimentary Rocks Rocks from Reefs Metamorphic Rocks The Rock Cycle Table of Contents."— Presentation transcript:

1 Rocks Classifying Rocks Igneous Rocks Sedimentary Rocks Rocks from Reefs Metamorphic Rocks The Rock Cycle Table of Contents

2 Rocks How Rocks Form Geologists classify rocks into three major groups: igneous rock, sedimentary rock, and metamorphic rock. - Classifying Rocks

3 Rocks Asking Questions Before you read, preview the red headings. In a graphic organizer like the one below, ask a what or how question for each heading. As you read, write answers to your questions. What does a rock’s color tell you? It can provide clues about the rock’s mineral and chemical composition. How do geologists describe a rock’s texture? Geologists use terms based on the size, shape, and patterns of the grains. QuestionAnswer - Classifying Rocks

4 Rocks End of Section: Classifying Rocks

5 Rocks Classifying Igneous Rocks Igneous rocks are classified according to their origin, texture, and mineral composition. - Igneous Rocks

6 Rocks Mineral Mixture Granite is a mixture of light- colored minerals, such as feldspar and quartz, and dark- colored minerals, including hornblende and different types of mica. But granite can vary in mineral composition. This affects its color and texture. Study the circle graph and then answer the questions. - Igneous Rocks

7 Rocks Mineral Mixture Feldspar Reading Graphs: What mineral is most abundant in granite? - Igneous Rocks

8 Rocks Mineral Mixture 10% Reading Graphs: About what percentage of granite is made up of dark minerals? - Igneous Rocks

9 Rocks Mineral Mixture 100% - (35% + 10%) = 55% Calculating: If the amount of quartz increases to 35 percent and the amount of dark-colored minerals stays the same, what percentage of the granite will be made up of feldspar? - Igneous Rocks

10 Rocks Mineral Mixture The overall color would be darker. Predicting: How would the color of the granite change if it contained less feldspar and more mica and hornblende? - Igneous Rocks

11 Rocks Detail Main Idea As you read the section “Classifying Igneous Rocks,” write the main idea in a graphic organizer like the one below. Then write three supporting details. The supporting details further explain the main idea. Igneous rocks are classified by origin, texture, and composition. Extrusive rock forms from lava on the surface; intrusive rock forms from magma from beneath the surface. Intrusive rocks have larger crystals than extrusive rocks because they cool more slowly. High-silica rocks are light colored; low- silica rocks are dark colored. - Igneous Rocks Identifying Main Ideas

12 Rocks Links on Igneous Rocks Click the SciLinks button for links on igneous rocks. - Igneous Rocks

13 Rocks End of Section: Igneous Rocks

14 Rocks From Sediment to Rock Most sedimentary rocks are formed through a series of processes: erosion, deposition, compaction, and cementation. - Sedimentary Rocks

15 Rocks Outlining As you read, make an outline about sedimentary rocks. Use the red headings for the main topics and the blue headings for the subtopics. Sedimentary Rocks I.From Sediment to Rock A.Erosion B.Deposition C.Compaction D.Cementation II.Types of Sedimentary Rock A.Clastic Rocks B.Organic Rocks C.Chemical Rocks III.Uses of Sedimentary Rocks A.Building Materials B.Tools - Sedimentary Rocks

16 Rocks Links on Sedimentary Rocks Click the SciLinks button for links on sedimentary rocks. - Sedimentary Rocks

17 Rocks End of Section: Sedimentary Rocks

18 Rocks What You Know What You Learned Using Prior Knowledge Before you read, look at the section headings and visuals to see what this section is about. Then write what you know about coral reefs in a graphic organizer like the one below. As you read, write what you learn. 1.Coral reefs grow in the oceans. 2.Florida has coral reefs. 3.Oceans used to be where there is dry land now. 1.Coral animals cannot live below 40 meters. 2.In the United States, only the coasts of Florida and Hawaii have coral reefs. 3.Some limestone deposits on land formed from ancient reefs. - Rocks From Reefs

19 Rocks More on Coral Landforms Click the PHSchool.com button for an activity about coral landforms. - Rocks From Reefs

20 Rocks End of Section: Rocks From Reefs

21 Rocks Previewing Visuals Before you read, preview Figure 17. Then write two questions that you have about metamorphic rocks in a graphic organizer like the one below. As you read, answer your questions. Previewing Q. Why do the crystals in gneiss line up in bands? A. Gneiss is a type of metamorphic rock that is foliated—the crystals are flattened to form parallel lines. Q. How does quartzite form from sandstone? A. High temperature and pressure on the minerals in sandstone cause them to be changed into minerals that make up quartzite. - Metamorphic Rocks

22 Rocks Links on Metamorphic Rocks Click the SciLinks button for links on metamorphic rocks. - Metamorphic Rocks

23 Rocks End of Section: Metamorphic Rocks

24 Rocks A Cycle of Many Pathways Forces deep inside Earth and at the surface produce a slow cycle that builds, destroys, and changes the rocks in the crust. - The Rock Cycle

25 Rocks Rock Cycle Activity Click the Active Art button to open a browser window and access Active Art about the rock cycle. - The Rock Cycle

26 Rocks Sequencing As you read, make a cycle diagram that shows stages in the rock cycle. Write each stage of the rock cycle in a separate circle in your diagram. Igneous Sedimentary Metamorphic - The Rock Cycle

27 Rocks End of Section: The Rock Cycle

28 Rocks Graphic Organizer Igneous Metamorphic Extrusive Organic Chemical Foliated

29 Rocks End of Section: Graphic Organizer


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