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The layer of soil beneath the topsoil that contains mostly clay and other minerals
Solid layer of rock beneath the soil
Soil organism that breaks down the remains of organisms and digests them
Process by which water, ice, wind or gravity moves weathered rock or soil
Process that splits rock when water seeps into cracks, then frees and expands
Geologic principle that the processes operated today operated the in the past to make Earth's surface
Grinding away of rock by other rock particles carried in water, ice, or wind
The layer of that differs in color and texture from the layer above or below it
Loose weathered material on Earth's surface in which plants can grow
Type of weathering in which rock is physically broke into smaller pieces
Anything in the environment that humans use
The loose layer of soil dead plant leaves and stems on the surface of the soil
Chemical change in which substances combines with oxygen (when iron oxidizes to form rust)
Plowing fields along the curves of a slope to prevent soil loss
The area of the great plains where wind erosion caused soil loss during the 1800's
Mixture of humus clay and other minerals that forms the crumbly topmost layer of soil
A thick mass of grass roots and soil
A measure of how well soil supports plant growth
The planting of different crops in a field each year to maintain the soil's fertility
Process that breaks down rock through chemical changes
The management of soil to prevent its destruction
Chemical and physical processes that break down rock at Earth's surface
Characteristics of a material that is full of tiny, connected air spaces that water can seep through
Dark-colored organic material in soil
Rich, fertile soil that is made up of about equal parts of clay sand and silt