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The Planet Rock

QuestionAnswer
Chemical Weathering The process by which rocks are decomposed or loosened by chemical processes to form sediments and other materials
Clay A sediment that is produced by physical weathering of rock. The particle size is smaller than silt.
Constructive Forces Forces that help in building new rocks and landforms.
Cycle A Pattern of change that reoccurs over time. It helps explain how natural events or phenomena occur.
Destructive Forces Forces that wear away rocks and landforms.
Erosion The processes that move weathered material form place to place. It occurs through the forces of gravity, wind, ice, water and human actions.
Glacial Abrasion The result of the scraping of rocks that are imbedded in the ice of the glacier against the rock bed beneath the glacier.
Glacial Plucking This refers to the slight melting of the bottom surface of the glacier that causes freezing and thawing in the cracks in the rocks below. The loosened rocks become imbedded or attached to the ice and move with the glacier.
Glacier A large mass of ice that has formed from many years of compacted snow. They are slow moving masses that change the surface of the Earth.
Gravel Sediment produced by physical weathering. It has large particles and is considered loose rocks that is larger than 2mm and smaller than 65 mm.
Humus The decomposed (rotting) organic material (living material) found in soil.
Igneous Rock Formed when molten rock material cools and hardens to become a solid. It is one of the three types of rocks.
Lava The magma that reaches the Earth's surface during a volcanic eruption.
Magma Molten rock material found beneath the Earth's surface, which forms igneous rock when it cools and hardens.
Metamorphic Rock Preexisting rocks in which minerals are changed be great pressure and heat.
Mineral A solid element or compound with an unique structure of atoms. They are formed by natural processes and are the building blocks of rocks.
Organic Material The living, or once living, material that makes up soil.
Particle Size The size of each grain of sediment.
Physical Weathering Refers to the effect of motion, such as wind, rain, waves, glacial movement, and freezing and thawing that wear away rock and bedrock.
Pressure A force that occurs when an object pushes on other objects. It is involved in the formation of sedimentary and metamorphic rocks.
Properties Are characteristics by which matter is described. Hardness, color, size, shape, flexibility, mass, and volume are some examples.
Rock A natural, solid earth material that is made of one or more different minerals.
Rock Cycle An endless process of change in which existing rocks are changed to new rocks.
Sand A sediment produced by physical weathering of rock. The particle size has visible grains of a variety of colors. It feels gritty to the the touch.
Sediment Is made of small pieces of broken rocks created by wind, water, or ice and carried to other locations. It includes, sand, silt, clay and gravel.
Sedimentary Rock Formed when sediments are deposited in layers, pressed down under great pressure over a long period of time, and become cemented or fastened together into a solid piece.
Silt A sediment produced by the physical weathering of rock. The particle size is smaller than sand, but larger than clay. It is often deposited in bottom of bodies of water.
Soil A mixture of organic and inorganic material that makes up the top layer of the surface of Earth. It provides the necessary nutrients and minerals for plant growth.
Thermal Contraction Refers to the decrease in volume due to change of temperature.
Thermal Expansion Refers to an increase in volume due to change in temperature.
Weathering The processes that causes mineral and rocks to become smaller. It includes the actions of frost, plant roots, thermal expansion, the rubbing of rocks upon rocks, moving water and wind, gases, and living organisms.
Created by: hworden
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