Soil Multiple Choice Test

About half of most soils are __________, such as the products of weathered rock, pebbles, sand, silt, and clay particles.

About half of all soils are organic materials, formed from the partial breakdown and decomposition of plants and animals

A _______ soil allows water to flow through it easily because the spaces between the inorganic particles are large and well connected.

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

Climate, Rock Types, Slope, Time, Biological Activity

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

The decayed remains of plant and animal life are called ______, which is an extremely important part of the soil.

_ develop as each layer of soil becomes progressively altered

Called the A-horizon, the _____ is usually the darkest layer of the soil because it has the highest proportion of organic material.

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.

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.

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