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


Physical And Chemical Characteristics Of Soil Layers. The Factors That Affect Soil Formation, Including The Action Of Living Things. TEACHERS: click here for quick copy question ID numbers.

The R horizon is known as
a) Organic matter
b) topsoil
c) weathered parent roCk
d) bedRock/paRent Rock

Which soil horizon is primarily responsible for this soil's fertility, or how well a soil can support vegetation (plant life)?
a) Horizon B, because plant roots can grow down into the smaller rock fragments.
b) Horizon A, because it contains humus and other organic nutrients plants need.
c) Horizon C, because most of the groundwater is stored in this horizon.
d) Horizon R, because it is the bedrock.

The C horizon is known as
a) weathered parent roCk
b) topsoil
c) suBsoil
d) bedRock/paRent Rock

The A horizon is known as
a) Organic matter
b) topsoil
c) suBsoil
d) weathered parent roCk

The B horizon is known as
a) topsoil
b) suBsoil
c) weathered parent roCk
d) bedRock/paRent Rock

layer of soil with distinct physical properties in a soil profile
a) soil profile
b) soil horizon
c)
d)

The O horizon is known as
a) Organic matter
b) topsoil
c) bedRock/paRent Rock
d) weathered parent roCk

What are the two things that cause soil to form?
a) Weathering of parent rock and decomposition and mixing by living things
b) Volcanic activity and metamorphism
c)
d)

vertical section of soil showing the soil horizons
a) soil profile
b) soil horizon
c)
d)

What is the third stage in the development of soil?
a) Developed soil supports thick vegetation.
b) Horizons begin to form.
c) Bedrock begins to break down.
d)

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