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WorksheetsUnit 5: Soil (6th Grade)
Total questions: 25
Worksheet time: 20mins
Name
Class
Date
1.
Which of the following is NOT one of the three types of soil?
a)
clay
b)
sand
c)
silt
d)
mud
2.
_______ is the type of soil used most often with plants and on farms. It is a mixture of clay, sand, and silt.
a)
loam
b)
humus
c)
soil
d)
dirt
3.
Are there minerals in soil?
a)
Yes
b)
No
4.
Ellen grabs a topsoil sample in her hand. She rolls it into a ball. The soil feels gritty and the ball falls apart. What part of the topsoil most likely made the topsoil feel gritty?
a)
clay
b)
sand
c)
silt
d)
humus
5.
When plants, animals, and other organisms die, they break down and become part of the soil. What is this part of the soil called?
a)
sand
b)
silt
c)
clay
d)
humus
6.
Which of the following is the largest particle in soil?
a)
gravel
b)
silt
c)
sand
d)
clay
7.
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?
a)
clay
b)
sand
c)
humus
d)
silt
8.
Which type of soil can hold the greatest amount of water?
a)
sand
b)
silt
c)
clay
d)
loam
9.
Many plants cannot grow in sandy soil. Why is this true?
a)
Sandy soil does not hold enough water.
b)
Air cannot pass through sandy soil.
c)
Roots cannot easily push through sandy soil.
d)
Sandy soil has too many nutrients.
10.
Wind blowing dirt and sand through the air is an example of...
a)
weathering
b)
erosion
11.
Soil is made of
a)
weathered rocks and minerals
b)
dead plants and animals
c)
air and water
d)
all of the above
12.
Water gets into the cracks of rock and freezes, causing the rock to break. What is this an example of?
a)
erosion
b)
weathering
13.
Soils form in layers, or _____.
a)
top soils
b)
mixtures
c)
horizons
d)
levels
14.
How freely water will flow through the open spaces in soil is called _____.
a)
particle size
b)
permeability
c)
quality
d)
composition
15.
The very top layer of soil is mostly made of
a)
Solid rock
b)
Clay and mineral deposits
c)
A mixture of minerals and organic material
d)
Mostly organic material (humus)
16.
Which layer of soil is on the bottom?
a)
topsoil
b)
subsoil
c)
bedrock
d)
bottomsoil
17.
Soil formation begins with the weathering of_______.
a)
Humas
b)
Subsoil
c)
Litter
d)
Rock
18.
the fertile, upper part of the soil
a)
clay
b)
sand
c)
silt
d)
topsoil
19.
Which horizon is made up of partially weathered rocks?
a)
Horizon A
b)
Horizon B
c)
Horizon C
d)
Horizon D or R
20.
In which horizon is most of the HUMUS?
a)
Horizon A
b)
Horizon B
c)
Horizon C
d)
Horizon D or R
21.
Horizon B
a)
is like horizon A.
b)
contains, clay and other materials leached from top-soil. It contains little humus.
c)
contains partly weathered material.
22.
Loam is
a)
soil made of about equal parts of clay, sand and silt.
b)
soil that contains more sand than silt or clay.
c)
soil that contains only clay.
d)
soil that has no silt.
23.
The MAIN thing Decomposers do for the the soil is the following:
a)
Store moisture
b)
Burrow deep in the soil
c)
Make space for air and water
d)
Break down and digest dead organisms
24.
What effect did over plowing and cutting down trees in the Great Plains during the 1930’s?
a)
It had little effect
b)
It increased soil fertility
c)
It was a primary cause of the Dust Bowl
d)
Farmers had a great harvest
25.
Which soil horizon contains lots of clay?
a)
Horizon A - Topsoil
b)
Horizon B - Subsoil
c)
Horizon C - Weathered parent material
d)
Bedrock
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