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science ch 2 vocab
Term | Definition |
---|---|
abrasion | The grinding away of rock by other rock particles carried in water, ice, or wind |
acidic | A word used to describe a substance that reacts strongly with metals and changes blue litmus paper red |
basic | A word used to describe a substance that feels slippery and changes red litmus paper blue |
bedrock | The solid layer of rock beneath the soil |
chemical weathering | The process that breaks down rock through chemical changes |
conservation plowing | Soil conservation method in which the dead stalks from the previous year's crop are left in the ground to hold the soil in place |
contour plowing | Plowing fields along the curves of a slope to prevent soil loss |
crop rotation | The planting of different crops in a field each year to maintain the soil's fertility |
crystal | A solid in which the atoms are arranged in a pattern that repeats again and again |
decomposer | Soil organism that breaks down the remains of organisms and digests them |
Dust Bowl | The area of the Great Plains where wind erosion caused soil loss during the 1930s |
erosion | The process by which water, ice, wind, or gravity moves weathered rock or soil |
fertility | A measure of how well soil supports plant growth |
humus | Dark-colored organic material in soil |
ice wedging | Process that splits rock when water seeps into cracks, then freezes and expands |
igneous rock | A type of rock that forms form the cooling of molten rock at or below the surface |
litter | The loose layer of dead plant leaves and stems on the surface of the soil |
loam | Rich, fertile soil that is made up of about equal parts of clay, sand, and silt |
mechanical weathering | The type of weathering in which rock is physically broken into smaller pieces |
metamorphic rock | A type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reactions |
mineral | A naturally occurring, inorganic solid that has a crystal structure and a definite chemical composition |
natural resource | Anything in the environment that humans use |
nonrenewable resource | A natural resource that is not replaced in a useful time frame |
ore | Rock that contains a metal or economically useful mineral |
oxidation | A chemical change in which a substance combines with oxygen, as when iron oxidizes, forming rust |
permeable | Characteristic of a material that is full of tiny, connected air spaces that water can seep through |
rock cycle | A series of processes on the surface and inside Earth that slowly changes rocks from one kind to another |
sediment | Small, solid pieces of material that come from rocks or organisms; earth materials deposited by erosion |
sedimentary rock | A type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together |
smelting | The process by which ore is melted to separate the useful metal from other elements |
sod | A thick mass of grass roots and soil |
soil | The loose, weathered material on Earth's surface in which plants can grow |
soil conservation | The management of soil to prevent its destruction |
soil horizon | The layer of soil that differs in color and texture from the layers above and below it |
subsoil | The layer of soil beneath the topsoil that contains mostly clay and other minerals |
topsoil | Mixture of humus, clay, and other minerals that forms the crumbly, topmost layer of soil |
uniformirarianism | The geologic principle that the same geologic processes that operate today operated in the past to change Earth's surface |
weathering | The chemical and physical processes that break down rock at earth's surface |