SCI Ch6 L4 The Story Of Soil #1 Question Preview (ID: 22190)


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When does soil begin to form?
a) When bedrock is broken
b) When dirt starts to grow
c) When it gets hot outside
d) When animals are born

Which of the following does not help to break apart rocks?
a) weather
b) plants
c) sun
d) animals

How do plants help break apart rock?
a) their leaves break the rock
b) their roots grow into the rock
c) their stems fall on the rock
d) they die and break the rock

How do animals help break apart rock?
a) they smash it with their paws
b) they don't help break apart rock
c) they burrow into the rock
d) they sleep on the rock

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

What is humus?
a) leftover plant and animal matter after they die and decompose
b) a tasty food that we eat
c) a song that birds sing
d) a part of the rock cycle

What is soil made from?
a) tiny rock particles, minerals, humus, water, and air
b) water, rain, snow, and wind
c) sun, humus, and water
d) minerals, lava, snow, and ice

How long does soil take to form?
a) about 1 day
b) twenty - fifty years
c) 400 days
d) hundreds - thousands of years

Complete the sentence - Soil forms in:
a) rows
b) layers
c) piles
d) circles

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

Which one describes the A horizon/topsoil best?
a) It is made of clay particles and minerals, is light in color, and some plant roots grow down 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 rich in humus and minerals, is dark in color, and most plants and organisms live here.

Which one describes the B horizon/subsoil best?
a) It is made of clay particles and minerals, is light in color, and some plant roots grow down 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 rich in humus and minerals, is dark in color, and most plants and organisms live here.

Which one describes the C horizon best?
a) It is made of clay particles and minerals, is light in color, and some plant roots grow down 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 rich in humus and minerals, is dark in color, and most plants and organisms live here.

What is a soil profile?
a) a layer of soil that looks different than the layers above and below it
b) a vertical section of soil from the surface down to bedrock
c) a picture of soil
d) the top layer of soil

What lies beneath the A, B, and C horizon of soil?
a) humus
b) lava
c) animals
d) solid bedrock

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