Types of Rocks
Rocks are naturally occurring solid material consisting of various minerals. Earth's crust is largely made up of rocks. Rocks are classified by mineral composition, how they were formed and other physical attributes such as texture. Igneous rocks are formed when molten magma cools. Sedimentary rocks are formed by deposition and hardening of clastic sediments, minerals precipitates and organic matter. Metamorphic rock forms when pre-existing rock undergoes changes due to high temperatures and pressures.
Play Quiz Games :| Grades | Quiz Games (with special printable formats for classroom use) | ||
|---|---|---|---|
| 3rd - 8th | Quiz on Types of Rocks | Quiz on Earth's Structure | Quiz on Earth and Rocks |
| The Rock Cycle | Rocks - Who am I? | Quiz on Earth's Rocks | |
| 6th - 12th | Identify the Rocks | Plate Tectonics | Weathering and Soils Quiz |
| Properties of Minerals | Weathering of Rocks | Dating Rocks, Rock Features | |
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Science Games, Diagrams & Activities :  Label the Diagram of Rock Cycle |  Jigsaw Puzzles |  Slide Puzzles |
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| Presentations on Types of Rocks : |
Science Videos & Lessons: (Reviewed by K-12 teachers) Our World: The Rock Cycle Grade: 3 - 12 Find out how moon rocks brought to Earth by the Apollo astronauts have helped NASA learn more about the rock cycle. Compare igneous, sedimentary and metamorphic rocks found on Earth to three types of rocks found on the moon. 4:10 |
Rocks Grade: 3 - 12 Types of rocks for kids - learn about the three main types of rock and the very different ways in which they are formed. 3:45 |
Identifying Types of Rocks Grade: 3 - 12 The three types of rocks are igneous, formed from molten rock, sedimentary, formed from the elements of an existing rock, and metamorphic, formed by a change in heat or pressure. Learn to identify the three different types of rocks in this lesson on rocks. 3:10 |
Introduction to Rocks and Minerals Grade: 3 - 12 The presentation examines the characteristics and physical properties of common rocks and minerals, and how the rock cycle works. 3:35 |
Physical Characteristics of Rocks Grade: 6 - 12 The clip explains that rocks have different characteristics, as rocks come in many different colors, textures and mineral compositions. 0:50 |
What are Igneous Rocks? Grade: 6 - 12 Lesson on Igneous Rocks. These rocks are those which were formed deep in the earth's crust by melting and then recrystallization. Examples include volcanic rocks, granite, syenite, gabbro and ultramafic rocks. 4:15 |
Identifying Igneous Rocks Grade: 6 - 12 Igneous rocks are formed both above and below ground. Learn about the intrusive and coarse-grained nature of igneous rocks. 0:50 |
Igneous Rocks Grade: 6 - 12 Igneous rocks, origin and bases of classification. 10:00 |
Clastic Sedimentary Rocks Grade: 6 - 12 Learn about classification by rock origin (sedimentary, igneous, metamorphic), weathering agents (clastic, chemical, biochemical), grain size, depositional environment and other factors. 10:00 |
Metamorphic Rocks Grade: 6 - 12 Find out about metamorphic rocks. 10:00 |
Identifying Metamorphic Rocks Grade: 6 - 12 Metamorphic rocks are formed from the re-melting and recrystallization of rocks, such as igneous and sedimentary rocks. Learn about the typical metamorphic rock characteristics. 0:50 |
The Rock Cycle Grade: 6 - 12 An educational lesson about the Rock Cycle. 2:20 |
Identifying Minerals Grade: 6 - 12 Learn about identifying rock-forming minerals by understanding the characteristics and formation of each mineral. 3:25 |
How Do Crystals Form? Grade: 6 - 12 Understand the formation of crystals in this video. 2:45 |
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