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Weathering and Soil (Improved)

Across
An organism that gets energy by breaking down biotic wastes and dead organisms, and returns raw materials to the soil and water.
The grinding away of rock by other rock particles carried in water, ice, or wind.
The process that breaks down rock through chemical changes.
Rich, fertile soil that is made up of about equal parts of clay, sand, and silt.
The type of weathering in which rock is physically broken into smaller pieces.
Rock that makes up Earth's crust; also the solid rock layer beneath the soil.
The crumbly, topmost layer of soil made up of clay and other minerals and humus.
Anything naturally occuring in the environment that humans use.
Down
A measure of how well soil supports plant growth.
A range of values used to indicate how acidic or basic a substance is; expresses the concentration of hydrogen ions in a solution.
Characteristic of a material that contains connected air spaces, or pores, that water can seep through easily.
The process by which water, ice, wind, or gravity moves weathered particles of rock and soil.
A chemical change in which a substance combines with oxygen, as when iron oxidizes, forming rust.
Soil conservation method in which weeds and dead stalks from the previous year's crop are plowed into the ground.
The geologic principle that the same geologic processes that operate today operated in the past to change Earth's surface.
The planting of different crops in a field each year to maintain the soil's fertility.
Process that splits rock when water seeps into cracks, then freezes and expands.
Dark-colored organic material in soil.
The loose, weathered material on Earth's surface in which plants can grow.
The chemical and physical processes that break down rock and other substances.
The layer of soil below topsoil that has less plant and animal matter than topsoil and contains mostly clay and other minerals.