Rocks Table of Contents Classifying Rocks Igneous Rocks

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

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

Rocks - Classifying 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. Question Answer What does a rock’s color tell It can provide clues about you? the rock’s mineral and chemical composition. How do geologists describe Geologists use terms based a rock’s texture? on the size, shape, and patterns of the grains.

Rocks End of Section: Classifying Rocks

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

Rocks - Igneous Rocks Mineral Mixture Granite is a mixture of lightcolored minerals, such as feldspar and quartz, and darkcolored 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.

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

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

Rocks - Igneous Rocks Mineral Mixture 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? 100% - (35% + 10%) = 55%

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

Rocks - Igneous Rocks Identifying Main Ideas 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. Main Idea Igneous rocks are classified by origin, texture, and composition. Detail Extrusive rock forms from lava on the surface; intrusive rock forms from magma from beneath the surface. Detail Intrusive rocks have larger crystals than extrusive rocks because they cool more slowly. Detail High-silica rocks are light colored; lowsilica rocks are dark colored.

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

Rocks End of Section: Igneous Rocks

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

Rocks - Sedimentary 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

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

Rocks End of Section: Sedimentary Rocks

Rocks - Rocks From Reefs 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. What You Know 1. 2. 3. Coral reefs grow in the oceans. Florida has coral reefs. Oceans used to be where there is dry land now. What You Learned 1. 2. 3. Coral animals cannot live below 40 meters. In the United States, only the coasts of Florida and Hawaii have coral reefs. Some limestone deposits on land formed from ancient reefs.

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

Rocks End of Section: Rocks From Reefs

Rocks - Metamorphic 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.

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

Rocks End of Section: Metamorphic Rocks

Rocks - The Rock Cycle 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.

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

Rocks - The Rock Cycle 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. Metamorphic Sedimentary Igneous

Rocks End of Section: The Rock Cycle

Rocks Graphic Organizer Metamorphic Igneous Extrusive Organic Chemical Foliated

Rocks End of Section: Graphic Organizer