Online Test — Rocks & Soil
10 Questions • 12 min • Chapter MCQ
12:00
Question 1 of 10
easy
The dark, rich top layer of soil is called…
Bedrock
Topsoil
The sky
Sand sea
Explanation: Topsoil is the rich upper layer.
Question 2 of 10
medium
We can protect soil by planting…
Metal sheets
Plastic
Glass
Trees and grass
Explanation: Plant roots hold soil in place and protect it.
Question 3 of 10
easy
Rotting leaves and dead plants in soil are called…
Plastic
Glass
Metal
Humus
Explanation: Humus is the dark rotted plant matter in soil.
Question 4 of 10
medium
Throwing plastic into soil is bad because plastic…
Does not rot and harms the soil
Feeds plants
Makes humus
Helps worms
Explanation: Plastic does not break down and pollutes soil.
Question 5 of 10
medium
As we dig deeper, the soil usually becomes…
More rocky and less rich
Softer and richer
Wetter forever
Lighter in colour only
Explanation: Lower layers have more rock and less humus.
Question 6 of 10
hard
Why does cracking, freezing and heating help make soil?
They grow the rock
They paint the rock
They break rock into smaller and smaller bits
They cool the Sun
Explanation: These actions slowly break rock into soil-sized bits.
Question 7 of 10
easy
A soft white rock used to write on a board is…
Marble
Granite
Chalk
Iron
Explanation: Chalk is a soft rock we write with.
Question 8 of 10
medium
Rocks can be…
Big boulders or tiny pebbles
Only huge
Only tiny
Always soft
Explanation: Rocks range from big boulders to small pebbles.
Question 9 of 10
hard
Why is soil important on top of the hard rock?
It is shiny
Plants can grow in soft soil
It is heavy
It blocks the Sun
Explanation: Plants need soft soil to take root and grow.
Question 10 of 10
medium
Some rocks contain useful metals like iron and are called…
Sweets
Ores
Soils
Seeds
Explanation: Rocks that hold metals are called ores.