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Week Fifteen 12/09

Weathering The Wearing away of sediments by wind, water, and ice.
Erosion The moving or carrying away of sediments to a new location.
Deposition The dropping of sediments at a new location.
Compaction The pressure of pressing together sediments.
Cementation When sediments that are pressed together get hot and the minerals melt causing it to stick together like cement or glue
Renewable Resources Resources that CAN be replaced in a short amount of time. (Wind, sun, crops, people, plants, trees, air, animals and water)
Non-renewable Resources Resources that CANNOT be replaced quickly. Takes millions of years. (Coal, Oil, and Natural Gas)
Decomposition When something that is dead goes through a chemical process and it breaks down into the soil making the soil richer
Soil The upper layer of Earth consisting of a mixture of organic remains, rocks, and clay particles
Gravel Smaller stones, pebbles of rock, no water stays, no nutrients
Organic Acquired from living matter
Retain To keep in or hold back
Sand Tiny particles of broken down rock, about the size of salt, very little water stays, loses water, no nutrients
Silt Finer and softer sand, like flour, silky smooth, slippery when wet, some water stays, some nutrients but erodes easily
Clay Sticky when wet, fine grained soil that does not allow water to flow through easily, hold too much water, needs nutrients, compacts when dried.
Humus Dark and chunky soil full of organic matter and plants, sticks and leaves.
Loam The best soil of all because it is a mixture of humus, clay and sand
Fossils Evidence of the past. They tell us about the Earth's past environment and species as well as climate and the atmosphere.
Imprint A mark or depression made by pressure
Biofuels Made from crops and can be used as an alternative resource like ethanol for our cars
Created by: ghscience5



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