Soil Layers and Soil Evolution

1.

Multiple Choice

1 min

1 pt

What is the name of Soil Horizon O?

Bedrock

Topsoil

Organic Layer

Subsoil

2.

Multiple Choice

1 min

1 pt

What is the name of Soil Horizon B?

Subsoil

Topsoil

Bedrock

Transition Zone

3.

Multiple Choice

20 sec

1 pt

Soil is formed slowly through the weathering of materials called ___.

Bedrock or parent material

Magma and lava

organic matter

leaves and litter

4.

Multiple Choice

1 min

1 pt

What are the two types of weathering?

Rain and Snow

Precipitation and Temperature

Physical and Chemical

Metal and Nonmetal

5.

Multiple Choice

1 min

1 pt

Large rocks fall from mountainsides

Chemical weathering

Mechanical weathering

6.

Multiple Choice

20 sec

1 pt

Formed by sulfur and nitrogen compounds will cause rocks to fall apart

hydration

carbonation

oxidation

acids

7.

Multiple Choice

1 min

1 pt

Water (usually from powerful waves) rushes into cracks in rocks; but a tiny bit of air is compressed at the crevice of the crack;

hydration

hydraulic action

extreme flooding

oxidation

8.

Multiple Choice

30 sec

1 pt

Especially in deserts, rocks heat up in the day and, as the temperature drops greatly at night, the rocks can flake easily (exfoliate).

hydraulic action

gravity

freeze/thaw

hydration

9.

Multiple Choice

20 sec

1 pt

What's in that soil?
If the soil is red or yellow it must have __ in it.

helium

oxidized iron

carbon

organic matter

10.

Multiple Choice

30 sec

1 pt

Mosses and lichens attach to rocks and this causes physical as well as chemical breakdown of the rock.

organic activity

decomposition

oxidation

carbonation

11.

Multiple Choice

30 sec

1 pt

Name that layer!
Layer where soil accumulates (holds) nutrients such as nitrogen and phosphorus.

Topsoil

Subsoil

Bedrock

Transition Zone

12.

Multiple Choice

30 sec

1 pt

Name that layer!
This is where minerals, materials, and substances move along with water through the soil, deeper into the ground (leaching).

O

E

B

R

13.

Multiple Choice

20 sec

1 pt

Name that layer!
Very dense layer; the color of this layer depends on the color of the bedrock.

C

R

O

A

14.

Multiple Choice

20 sec

1 pt

Name that layer!
A mix of leaf litter and humus occupy this soil layer.

O

A

E

B

15.

Multiple Choice

20 sec

1 pt

The tool we use to identify soil based on percentages of silt, sand and clay.

Soil Texture Triangle

Soil Texture Square

Chromotography

An expensive filtration system

16.

Multiple Choice

30 sec

1 pt

What's in that soil?
If the color of soil is light colored it is most likely part of the __ layer in the soil profile.

A

O

E

C

17.

Multiple Choice

1 min

1 pt

The layer of soil which the topsoil is found.

Horizon A

Horizon B

Horizon C

Horizon D or R

18.

Multiple Choice

20 sec

1 pt

Layers of soil are also known as:

Soil Profiles

Soil Horizons

Soil sheets

Soil cores

19.

Multiple Choice

2 mins

1 pt

In which layer of the soil profile contains the MOST humus?

Layer 1

Layer 2

Layer 3

Layer 4

20.

Multiple Choice

1 min

1 pt

Which of the following is NOT one of the three types of soil?

clay

sand

silt

mud

21.

Multiple Choice

1 min

1 pt

Which of the following is the largest particle in soil?

sand

silt

humus

clay

22.

Multiple Choice

3 mins

1 pt

You dig a small hole in the soil and the next day it rains. The hole fills with water, but does not empty even after several days of dry weather. What is the soil mostly made of?

clay

sand

humus

silt

23.

Multiple Choice

30 sec

1 pt

In which horizon of soil profile does leaching normally occur?

regolith

subsoil

topsoil

bedrock

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