Soil — Quiz Answers

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A soil test shows that the B horizon contains a large amount of clay but relatively low organic content. What does this suggest about the B horizon's role in nutrient availability?

A
It is a biologically active zone with abundant root systems.
B
It is the main source of nutrients for plants.
C
It prevents nutrients from reaching the topsoil due to poor water movement.
D
It is less directly involved in feeding plant roots.
3

Where would a researcher likely find the greatest level of organic activity?

A
about 90 cm below the surface
B
about 50 cm below the surface
C
about 30 cm below the surface
D
about 3 cm below the surface
5

After a heavy rain, water is pooling near the surface in a garden bed. Which soil horizon is most likely causing this issue?

A
B horizon, because it contains dense clay and iron that slow drainage
B
O horizon, because it absorbs water slowly due to organic debris
C
A horizon, because it resists infiltration from surface water
D
R horizon, because it actively repels water from its surface
6

A farmer notices that plants in one part of a field are growing poorly, even though the topsoil looks healthy. What is the most likely explanation?

A
The A horizon is too shallow for root growth.
B
The B horizon may be compacted, limiting drainage and root penetration.
C
The R horizon has become biologically active and is drawing nutrients from the upper layers.
D
The O horizon lacks decomposed organic material.
7

Match each horizon with its typical feature.

Answer:

rich in organic material|topsoil with minerals and organic matter|accumulation zone with clay and minerals|partially weathered parent material

8

Arrange the soil horizons from surface to bedrock. Place the uppermost horizon at the top of the list.

Answer not available
9

Match each formation type to its defining feature.

Answer:

forms from the bedrock|carried by wind or water|deposited by river systems|moved by ice and meltwater

10

Match each horizon with its typical feature.

Answer:

rich in organic material|topsoil with minerals and organic matter|accumulation zone with clay and minerals|partially weathered parent material

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Soil — Quiz Answers — Earth Science