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Earth Sc. Chapter 2
Question | Answer |
---|---|
Uniformitarianism | The geologic record that shows where rock layers ben lost due to erosion. |
Erosion | The process by which water, ice, wind, or gravity moves weathered particles of rock ad soil. |
Weathering | The chemical and physical processes that break down rock and other substances. |
Mechanical Weathering | The type of weathering in which rock is physically broken 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 | Characteristics of a material that contains connected air spaces, or pores, that water can seep through easily. |
Soil | The loose, weathered material on Earth's surface in which plants can grow. |
Bedrock | Rock that makes up Earth's crust; also the solid rock layer beneath the soil. |
Humus | 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 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 minerals and humus (nutrients and 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 the soil and water. |
Natural Resource | Anything naturally occurring in the environment that humans use. |
Soil Conservation | The management of soil to limit its destruction. |
Crop Rotation | The planting of different crops in a field each year to maintain the soil's fertility. |
Contour Plowing | Plowing fields 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's crop are plowed into the ground. |