C2 4.2 Sedimentary Rocks

Question 1

What are the three groups of rocks?

Answer 1

Sedimentary, igneous and metamorphic

Question 2

Are sedimentary rocks soft or hard?

Answer 2

Soft

Question 3

What are the three types of weathering?

Answer 3

Physical, chemical and biological

Question 4

Describe freeze-thaw weathering

Answer 4

Water gets into a crack in a rock. When it gets colder, the water freezes and turns into ice. Ice takes up more space than liquid water and the crack in the rock gets bigger until eventually it breaks.

Question 5

Describe chemical weathering

Answer 5

Acids in the rain react with chemicals in the rock

Question 6

Name two things that can cause biological weathering

Answer 6

Plants and animals

Question 7

Give two examples of sedimentary rocks

Answer 7

Limestone and sandstone

Question 8

Give four things that can cause transport of sediment

Answer 8

Water, wind, gravity and ice

Question 9

What is the name of the process where sediments settle in one place?

Answer 9

Deposition

Question 10

What is erosion?

Answer 10

Weathering and transport together

Question 11

What is compaction?

Answer 11

The weight of sediments above pressing the sediments below

Question 12

What is cementation?

Answer 12

A substance such as salt water sticking sediments together

Question 13

Sedimentary rocks have gaps between their grains. Are they porous or non-porous?

Answer 13

Porous