IMO Practice Test — Rocks & Soil
6 Questions • 12 min • Olympiad level
12:00
Question 1 of 6
hard
Tree roots help stop the soil from being washed or blown away. This is called preventing soil…
Painting
Cooking
Erosion
Lighting
Explanation: Roots hold soil and prevent erosion.
Question 2 of 6
hard
Why do we say rock is a natural material?
It forms in nature, not in a factory
It is grey
It is heavy
People build it
Explanation: Rock forms naturally in the Earth.
Question 3 of 6
hard
If heavy rain washes away the topsoil, farmers worry because…
Plants grow faster
The sky changes
Bedrock grows
The richest soil for crops is lost
Explanation: Losing topsoil means losing the best soil for crops.
Question 4 of 6
medium
Earthworms help make good soil by…
Turning it to rock
Eating all the plants
Drying it
Mixing it and adding their waste
Explanation: Earthworms loosen and enrich the soil.
Question 5 of 6
hard
Sandy soil lets water drain away quickly, while clay soil holds water. This shows soils differ in how they hold…
Light
Water
Sound
Colour
Explanation: Different soils hold water differently.
Question 6 of 6
hard
Coal is a rock that is special because it can…
Burn to give heat
Float on water
Glow at night
Grow bigger
Explanation: Coal burns and gives heat — used as a fuel.