Unit 2 Lesson 5 Soil Formation ~ Part 2: Question Preview (ID: 30163)


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Burrowing animals, such as earthworms and moles, increase the rate of weathering, loosen and mix the soil, increasing the amount of air to enter and the ability of the soil to drain water.
a) TRUE b) FALSE c) d)
Soil formation and development are quick processes.
a) TRUE b) FALSE c) d)
the largest layer of weathered rock fragments with little or no organic matter from which soil is formed; lies directly above the parent rock/bedrock
a) litter - horizon O b) topsoil - horizon A c) subsoil - horizon B d) parent rock/regolith - horizon C
process that carries materials such as iron minerals and clay from the A horizon to the B horizon as a result of water seeping down, or moving through
a) leaching b) soil pH c) soil fertility d) soil texture
the layer of soil below topsoil that is not as developed, contains leached materials and has less humus
a) litter - horizon O b) topsoil - horizon A c) subsoil - horizon B d) parent rock/regolith - horizon C
the least-developed soil horizon with the largest rock fragments and usually no organic matter; lies directly over the parent rock
a) litter - horizon O b) topsoil - horizon A c) subsoil - horizon B d) parent rock/regolith - horizon C
a vertical section of soil that shows soil horizons, or layers of soil
a) soil profile b) soil horizon c) soil texture d) soil chemistry
each distinct layer of soil within a soil profile
a) soil profile b) soil horizon c) soil texture d) soil chemistry
the top, most developed layer of soil made of humus
a) litter - horizon O b) topsoil - horizon A c) subsoil - horizon B d) regolith - horizon C
dead leaves, grass, branches, and other organic matter that covers the the surface of the topsoil
a) litter - horizon O b) topsoil - horizon A c) subsoil - horizon B d) regolith - horizon C
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