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Chapter7-8
| Term | Definition |
|---|---|
| Fold Mountain | A mountain made up mostly of rock layers folded by being squeezed together. |
| Fault-block mountain | A mountain made by huge tilted blocks of rocks seperated from surrounding rocks by faults. |
| Weathering | The breaking down of rocks into smaller pieces by natural process. |
| Erosion | The picking up and removal of rock particles. |
| Soil | A mixture of weathered rock, decayed plants, and animal matter, living things, air, and water |
| Humus | Material in soil formed by the break down of plant and animal material. |
| Soil horizon | Any of the layers of soil from the surface to the bedrock below. |
| Ground water | Water that soaks into soil and rock by collecting in spaces between rock particles. |
| Mass wasting | The down hill movement of earth material caused by gravity. |
| Deposition | The dropping off of sediment. |
| Glacier | A huge sheet of ice and snow that moves slowly over land. |
| Till | A jumble of many sizes of sediment deposited by a glacier. |
| Moraine | A deposit of many sizes of sediment in front of or along the sides of a glacier. |
| Mineral | A naturally occuring solid in earth's crust with a definite structure and composition. |
| Igneous rock | A rock that forms when hot liquid lava cools and hardens into a solid. |
| Sedimentary rock | A rock that forms from pieces of other rocks that are squeezedor cemented together. |
| Metamorphic rock | A rock that forms from another kind of rock that is changed by heat, pressure, or a chemical reaction. |
| Rock cycle | Rocks continually changing from one kind of rock to another in a never ending process. |
| Superposition | The idea that in a series of rock layers the bottom layer is the oldest and the top layer is the youngest. |
| Relative age | The age of a rock as compared with another rock. |
| Geologic column | A listing of Earth's rock layers on order from oldest to youngest. |
| fossil | Any trace, imprint, or remains of a living thing preserved in Earth's crust. |
| Index fossil | The remains of a living thing that was wide spread but lived for only a short period of Earth's history. |
| Half-life | The time it takes for half the mass of a radioactive element in a rock to break down, or decay,in to other elements. |
| Absolute age | The age in years, as determind by measuring the decay rate of it's radioactive elements |
| Era | one of four longest stretches of time in Earth's history from earliest "precarnbrian" era through the "paleozoic" and "mesozoic"eras, to the current"cenozoic" era. |
Created by:
17mhastings
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