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Week Fifteen 12/09
Term | Definition |
---|---|
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 |