C2 4.2 Sedimentary Rocks Flashcards Preview

SHHS - Science - C2.4 The Earth - Year 8 > C2 4.2 Sedimentary Rocks > Flashcards

Flashcards in C2 4.2 Sedimentary Rocks Deck (13)
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1

What are the three groups of rocks?

Sedimentary, igneous and metamorphic

2

Are sedimentary rocks soft or hard?

Soft

3

What are the three types of weathering?

Physical, chemical and biological

4

Describe freeze-thaw weathering

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.

5

Describe chemical weathering

Acids in the rain react with chemicals in the rock

6

Name two things that can cause biological weathering

Plants and animals

7

Give two examples of sedimentary rocks

Limestone and sandstone

8

Give four things that can cause transport of sediment

Water, wind, gravity and ice

9

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

Deposition

10

What is erosion?

Weathering and transport together

11

What is compaction?

The weight of sediments above pressing the sediments below

12

What is cementation?

A substance such as salt water sticking sediments together

13

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

Porous