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SCI Ch6 L4 The Story Of Soil #1
Test Description: Science Practice
Instructions: Answer all questions to get your test result.
1) When does soil begin to form?
A
When dirt starts to grow
B
When bedrock is broken
C
When it gets hot outside
D
When animals are born
2) Which of the following does not help to break apart rocks?
A
animals
B
weather
C
plants
D
sun
3) How do plants help break apart rock?
A
their roots grow into the rock
B
their leaves break the rock
C
they die and break the rock
D
their stems fall on the rock
4) How do animals help break apart rock?
A
they sleep on the rock
B
they smash it with their paws
C
they don't help break apart rock
D
they burrow into the rock
5) How to bacteria and fungi help make soil?
A
they make dirt grow
B
they help animals burrow
C
they cause rocks to break apart
D
they decompose dead animals and plants which makes humus
6) What is humus?
A
a tasty food that we eat
B
a song that birds sing
C
a part of the rock cycle
D
leftover plant and animal matter after they die and decompose
7) What is soil made from?
A
minerals, lava, snow, and ice
B
water, rain, snow, and wind
C
tiny rock particles, minerals, humus, water, and air
D
sun, humus, and water
8) How long does soil take to form?
A
400 days
B
about 1 day
C
twenty - fifty years
D
hundreds - thousands of years
9) Complete the sentence - Soil forms in:
A
layers
B
circles
C
piles
D
rows
10) What is a soil horizon?
A
a bunch of layers of soil put together
B
a layer of soil that looks just like the others
C
a layer of soil that looks different than the layers above and below it
D
the bottom layer of soil
11) Which one describes the A horizon/topsoil best?
A
It is made of solid bedrock.
B
It is rich in humus and minerals, is dark in color, and most plants and organisms live here.
C
It is made of broken-down bedrock, and is beyond the reach of plants.
D
It is made of clay particles and minerals, is light in color, and some plant roots grow down here.
12) Which one describes the B horizon/subsoil best?
A
It is rich in humus and minerals, is dark in color, and most plants and organisms live here.
B
It is made of broken-down bedrock, and is beyond the reach of plants.
C
It is made of solid bedrock.
D
It is made of clay particles and minerals, is light in color, and some plant roots grow down here.
13) Which one describes the C horizon best?
A
It is rich in humus and minerals, is dark in color, and most plants and organisms live here.
B
It is made of solid bedrock.
C
It is made of clay particles and minerals, is light in color, and some plant roots grow down here.
D
It is made of broken-down bedrock, and is beyond the reach of plants.
14) What is a soil profile?
A
a vertical section of soil from the surface down to bedrock
B
a layer of soil that looks different than the layers above and below it
C
a picture of soil
D
the top layer of soil
15) What lies beneath the A, B, and C horizon of soil?
A
lava
B
humus
C
animals
D
solid bedrock
*select an answer for all questions
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