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| Question | Answer |
|---|---|
| uniformitarianism | The geologic principle that the same geologic processes that operate today operated in the past to change Earths surface |
| erosion | The process by which water ice and wind or gravity moves weathered particles of rock and soil |
| weathering | The chemical and physical processes that break down rock and other substance |
| chemical weathering | The process that breaks down rock through chemical changes |
| abrasion | The grinding away of rock brother 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 space or pores that water can seep through easily |
| soil | Thee lose weather material on Earths surface in witch plants and grow |
| bedrock | Rock that makes up Earths crust also the solid rock layer beneath the soil |
| hums | Dark colored organic material in soil |
| fertility | A measure of how well soil supports plant growth |
| loam | Rich fertile soil that is made up of about equal parts of clay sand and slit |
| pH scale | A range of values used to indicate how acidic or basic a substance is express the concentration of hydrogen ions a soution |
| soil horizon | A layer of soils that differs in color and texture form the layers above or below it |
| topsoil | The crumbly topmost layer of soil made up of clay and other minerals and humans (nutrients and delaying plant animal matter) |
| subsoil | A layer of soil below topsoil that has less plant and animal matter that topsoil and contains mostly clay and other minerals |
| decomposr | An organism that gets energy by breaking down waste and dead organisms and returns raw materials to soil and water |
| natural resoure | Anything naturally occurring in the envonment that humans use |
| soil conservation | The loose weathered material on Earths surface in which plants grow |
| crop rotation | The planting of different crops in a field each year to maintain the soils fertility |
| contour plowing | Plowing fields along the curves of a slope to prevent soil loss |
| conservation plowing | oil conservation method in which weeds and dead stalks from the previous tears crop are plowed into the ground |
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