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Science 2

QuestionAnswer
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 processes.
Erosion The picking up and removal of rock particles.
Soil A mixture of weathered rock, decaying plant and animal material, living things, air, and water.
Humus Material in soil formed by the breaking down of dead plant and animal material.
Soil Horizon Any of the 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 material caused by gravity.
Depostion The dropping off of sediment.
Glacier A huge sheet of ice and snow that moves slowly over the 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 compostion.
Igneous Rock A rock that forms when hot, liquid lava cools and hardens into a soild.
Sedimentary Rock A rock that forms from pieces of other rocks that are 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 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 in 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 widespread but lived for a short part in 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 as determined by measuring the decay rate of its radioactive elements.
Era One of the fur long stretches of time in Earth's history: from the earliest Precambrian era, through the Paleozoic era and Mesozoic era, to the current Cenozoic era.
Created by: 17frichardson
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