Grade 9 Geography (Rocks)

Rock is...

• A mixture of sand

• A mixture of minerals

• A mixture of calcium carbonate

Granite has...

• Three colours

• Two colours

• One colour

• Four colours

Sandstone is made out of...

• Mainly quartz, often mixed with calcite

• The shells of sea creatures

• Mainly quartz, often mixed with feldspars

How many known minerals are there?

• 6000

• 5000

• 10000

• 8000

• 1000

How many common minerals are there?

• 50

• 10

• 20

• 100

What is a mineral?

• A natural compound

• A mixture of atoms

• A mixture of oxygen and carbon dioxide

Select the correct steps of the rock cycle.

• Sand ➜ sedimentary rock ➜ metamorphic

  rock ➜ igneous rock

• Sedimentary rock ➜ sand ➜ igneous rock

• Igneous rock ➜ metamorphic rock ➜ sand

Arrange the soil profile in order:

1) Topsoil

2) Subsoil

3) Weathered rock

4) Humus

5) Bedrock

• 1,3,4,2,5

• 3,2,4,1,5

• 4,1,2,3,5

• 5,4,3,2,1

What is humus?

• Solid rock

• A thin layer of rotting vegetation

• A layer of cows and chickens

• A layer of sand

What is bedrock?

• Sand

• Solid plastic

• Solid rock

• Weathered rock