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21 January, 18:24

1. How do clastic sedimentary rocks form?

a Solid chemicals in water harden and form rocks.

b Fragments of rock are squeezed and cemented together.

c Plant and animal remains are squeezed and cemented together.

d Lava cools and hardens into rock.

2. Which option gives two examples of clastic sedimentary rock?

a coquina and shale

b shale and sandstone

c limestone and sandstone

d coquina and limestone

3. A geologist finds a section of rock that shows ripple marks.

What does the presence of ripple marks say about the area where the rock formed?

a The rock formed under Earth's surface at very high temperatures.

b The rock formed from mollusk shells.

c The rock was blown out of a volcano.

d The rock formed in a fast-moving stream.

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Answers (1)
  1. 21 January, 18:44
    0
    1. B

    Clastic sedimentary rocks are formed by fragments of rock that are squeezed and cemented together.

    2. B.

    Shale and sandstone are both considered clastic sedimentary rocks.

    3. D

    The rock formed in a fast-moving stream.
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