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Chapter 8 vocab
Question | Answer |
---|---|
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 separated 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 weatherd rock,decayed plant 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 layers of soil from the surface to the bedrock below |
Groundwater | Water that soaks into soil and rock by collecting in spaces between rock particles |
Mass wasting | The downhill movement of Earth's 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 occurring solid in Earth's crust with a definite structure and composition |
Igneous rock | A rock that forms when hot,liquid lava cools and hardens |
Sedimentary rock | A rock that forms from pieces of other rocks squeezed or 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 into another in a never ending process |
Superposition | The idea that in a series of rocks the bottom layer is the oldest and the top is the youngest |
Relative age | The age of a rock as compared to another |
Geologic column | A listing of Earth's rock layers in order from oldest to youngest |
Fossil | Any trace,imprint,or remains a living thing persevered in Earth's crust |
Index fossil | The remains of a living thing that was widespread but lived in only a short part of Earth's history |
Half life | The time it takes for half the mass of a radioactive element in a rock to break apart or decay into other elements |
Absolute age | The age of a rock in years determined by measuring the decay rate of its radioactive elements |
Era | One of the four long stretches of time in Earth's history from the earliest Precabrian era through the Paleozoic and Mesozoic eras to the Cenozonic era |