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When earthworms add their wastes to the soil, then die and decay in the soil, they are contributing to the formation of__________.
erosion
weathering
nearly equal amounts of silt, sand, and clay.
humus.
It helped cause the Dust Bowl.
clay, minerals, and little humus.
meanders
the mountains have been eroding for millions of years.
Plowing removed the grass from the Great Plains and exposed the soil. What effect did this have when a drought struck the Great Plains during the 1930s?
erosion
weathering
nearly equal amounts of silt, sand, and clay.
humus.
It helped cause the Dust Bowl.
clay, minerals, and little humus.
meanders
the mountains have been eroding for millions of years.
The type of soil called loam is made up of___________.
erosion
weathering
nearly equal amounts of silt, sand, and clay.
humus.
It helped cause the Dust Bowl.
clay, minerals, and little humus.
meanders
the mountains have been eroding for millions of years.
A river flowing across a wide flood plain begins to form looplike bends called
erosion
weathering
nearly equal amounts of silt, sand, and clay.
humus.
It helped cause the Dust Bowl.
clay, minerals, and little humus.
meanders
the mountains have been eroding for millions of years.
In a cross section of soil, the B horizon consists of_________.
erosion
weathering
nearly equal amounts of silt, sand, and clay.
humus.
It helped cause the Dust Bowl.
clay, minerals, and little humus.
meanders
the mountains have been eroding for millions of years.
What causes rock to break down as it moves from the bedrock to the A horizon?
erosion
weathering
nearly equal amounts of silt, sand, and clay.
humus.
It helped cause the Dust Bowl.
clay, minerals, and little humus.
meanders
the mountains have been eroding for millions of years.
The process by which natural forces move weathered rock and soil from one place to another is called
erosion
weathering
nearly equal amounts of silt, sand, and clay.
humus.
It helped cause the Dust Bowl.
clay, minerals, and little humus.
meanders
the mountains have been eroding for millions of years.
Geologists infer from the rounded, eroded shapes of the Appalachain Mountains that_________.
erosion
weathering
nearly equal amounts of silt, sand, and clay.
humus.
It helped cause the Dust Bowl.
clay, minerals, and little humus.
meanders
the mountains have been eroding for millions of years.
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