Soil Question Preview (ID: 47235)


Vocabulary Review. TEACHERS: click here for quick copy question ID numbers.

The _______ is a layer of partially altered bedrock. There is some evidence of weathering in this layer, but pieces of the original rock are seen and can be identified.
a) C-horizon
b) subsoil
c) topsoil
d) humus

The B-horizon or ______ is where soluble minerals and clays accumulate. This layer is lighter brown and holds more water than the topsoil because of the presence of iron and clay minerals. There is less organic material.
a) subsoil
b) Topsoil
c) C horizon
d) humus

____ _____ develop as each layer of soil becomes progressively altered
a) Soil horizons
b) top soil
c) sub soil
d) Humus

Called the A-horizon, the _____ is usually the darkest layer of the soil because it has the highest proportion of organic material.
a) Topsoil
b) Subsoil
c) Humus
d) C horizon

The decayed remains of plant and animal life are called ______, which is an extremely important part of the soil.
a) Humus
b) topsoil
c) subsiol
d) Horizon B

Climate, Rock Types, Slope, Time, Biological Activity
a) Factors in Soil Formation
b) Factors of minerals
c) Factors of water
d) factors of the atmosphere

More rain yields greater chemical reactions to weather minerals and rocks o Increased rainfall increases the amount of rock that is dissolved because as materials are carried away new surfaces are exposed, which increases the rate of weathering o Inc
a) Affect of Climate on Soil Fomation
b) Affect of Rock type on soil Formation
c) Affect of Slope on soil formation
d) affect of time on soil formation

Soil types are determined by their percentages of sand, silt, and clay. o The percentages of sand, silt, and clay correspond to the type of soil in the diagram below
a) Soil Classification
b) Soil Ecosystem
c) Texture
d) Organic

A _______ soil allows water to flow through it easily because the spaces between the inorganic particles are large and well connected.
a) permeable
b) impermeable
c) loam
d) Organic

About half of most soils are __________, such as the products of weathered rock, pebbles, sand, silt, and clay particles.
a) Inorganic Materials
b) Permeable
c) loam
d) organic materials

About half of all soils are organic materials, formed from the partial breakdown and decomposition of plants and animals
a) Organic Materials
b) Inorganic materials
c) Permeable
d) Loam

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