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Stack #4530451
| Question | Answer |
|---|---|
| uniformitarianism | The geologic principle that the same gelogic process that operate today operated in the past to change Earths surface. |
| erosion | The process by which water,ice,wind or gravity moves weathered particles of rock and soil. |
| weathering | The chemical and physical process that break down rock and other substances. |
| mechanical weathering | The type of weathering in which rock is physically broken down into smaller pieces. |
| chemical weathering | The process that breaks down rock through chemical changes. |
| abrasion | The grinding away of rock by other rock particles carried in water,ice, or wind. |
| frost wedging | Process that splits rock when water seeps into cracks, then freezes and expands. |
| oxidation | A chemical change in which a substance combines with oxygen, as when iron oxidizes, forming rust. |
| permeable | Characteristic of a material that contains connected air spaces,or pores, that water can seep through easily. |
| soil | The loose,weathered material on Earths surface in which plants can grow. |
| bedrock | Rocks that make up Earths crust, also the solid rock layer beneath the soil. |
| humus | Dark-colored organic material in soil. |
| fertility | A measure of how well soil supports a plant. |
| loam | Rich,fertile soil that Is made up of about equal parts of clay,sand, and silt. |
| pH scale | A range of values used to indicate how acidic or basic a substance is, expresses the concentration of hydrogen ions in a solution. |
| soil horizon | A layer of soil that differs In color and texture from the layers above or below it. |
| topsoil | The crumbly,topmost layer of soil made up of clay and other materials and humus decaying plant and animal matter. |
| subsoil | The layer of soil below topsoil that has less plant and animal matter than topsoil and contains mostly clay and other minerals. |
| decomposer | An organism that gets energy by breaking down wastes and dead organisms, and returns raw materials to soil and water. |
| natural resource | Anything naturally occurring in the environment that humans use. |
| soil conservation | The management of soil to limits its destruction . |
| crop rotation | The planting of different crops in a field each year to maintain the soils fertility. |
| contour plowing | Plowing field along the curves of a slope to prevent soil loss. |
| conservation plowing | Soil conservation method in which weeds and dead stalks from the previous year crop are plowed into the ground. |