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Science Vocab Ch. 8
Rocks; Lessons 1 - 4
| Term | Definition |
|---|---|
| Rock | A ... is a natural, solid mixture of minerals or grains. |
| Grain | Geologists call the fragments that make up a rock ... |
| Texture | The grain size and the way grains fit together in a rock are called ... |
| Magma | You might remember that when ..., molten or liquid rock underground, cools, mineral crystals form. |
| Lava | Molten rock that erupts on Earth's surface is called ... |
| Sediment | ... is rock material that forms where rocks are broken down into smaller pieces or dissolved in water as rocks erode. |
| Rock Cycle | The series of processes that change one type of rock into another type of rock is called the ... |
| Extrusive Rock | When volcanic material erupts and cools and crystallizes on Earth's surface, it forms a type of igneous rock called ... |
| Volcanic Glass | ... is rock that forms when lava cools too quickly to forms crystals, such as the obsidian shown in Figure 8. |
| Intrusive Rock | Igneous rocks that form as magma cools underground are called ... |
| Compaction | The weight from the layers of sediment forces out fluids and decreases the space between grains during a process called ... |
| Cementation | When minerals dissolved in water crystallize between sediment grains, the process is called ... |
| Clastic Rock | Sedimentary rocks that are made up of broken pieces of minerals and rock fragments are known as ... |
| Clast | The broken pieces and fragments are called ... |
| Chemical Rock | ... form when minerals crystallize directly from water. |
| Biochemical Rock | ... is a sedimentary rock that was formed by organisms or contains the remains of organisms. |
| Metamorphism | ... is any process that affects the structure or composition of a rock in a solid state as a result of changes in temperature, pressure, or the addition of chemical fluids. |
| Plastic Deformation | This permanent change in shape by bending and folding is called ... |
| Foliated Rock | ... contain parallel layers of flat and elongated minerals. |
| Nonfoliated Rock | Metamorphic rocks that have mineral grains with a random, interlocking texture are ... |
| Contact Metamorphism | During ..., magma comes in contact with existing rock, and its thermal energy and gases interact with the surrounding rock and forms new metamorphic rock. |
| Regional Metamorphism | ... is the formation of metamorphic rock bodies that are hundreds of square kilometers in size. |