Vocabulary Chapters 4/5
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Created by:
epaquet263 on January 23, 2011
Subjects:
Description:
Science chapters 4/5 vocab
Classes:
8th Grade Larson Middle School
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17 terms
Terms | Definitions |
|---|---|
 Magma | Molten rock below Earth's surface |
| Lava | Magma that flows out onto Earth's surface |
| Intrusive Rocks | Course-grained igneous rocks that form when molten rock cools slowly and solidifies inside Earth's crust |
| Extrusive Rocks | Fine-grained igneous rocks that form when molten rock cools quickly and solidifies on Earth's surface |
| Basaltic Rock | Rock that is dark colored, has lower silica contents, and is rich in iron and magnesium; contains mostly plagioclase and pyroxene |
| Granite Rock | Light-colored rock that has high silica content, and contains quartz and potassium feldspar |
| Texture | The size, shape, and distribution of the crystals or grains that make up rock |
| Pegmatite | Vein deposits of extremely large-grained minerals that can contain rare ores such as lithium and beryllium |
| Kimberlite | Rare, ultramafic rock that can contain diamonds and other minerals formed only under very high pressures. |
| Vesicular | A spongy looking rock; lava whose gas bubbles do not escape |
| Porphyritic | Rock texture characterized by large, well-formed crystals surrounded by finer-grained crystals of the same or different mineral |
| Mineral | Naturally occurring, inorganic solid with a specific chemical composition and a definite crystalline shape |
| Crystal | Solid in which atoms are arranged in repeating patterns |
| Luster | The way that a mineral reflects light from its surface; two types - metallic and nonmetallic |
| Fracture | When a mineral breaks into pieces with arclike, rough, or jagged edges |
| Silicates | Minerals that contain silicon (Si), oxygen (O), and usually one or more other elements |
| Ore | Mineral that contains a valuable substance that can be mined at a profit |
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