IMO Practice Test — The Water Cycle
6 Questions • 12 min • Olympiad level
12:00
Question 1 of 6
hard
Cutting too many trees can reduce rainfall because trees help return water to the air through their…
Leaves
Roots only
Bark only
Shadows
Explanation: Trees release water vapour from their leaves, aiding rain.
Question 2 of 6
hard
Salt is left behind when sea water evaporates. This shows that evaporation lifts up the ___ but not the salt.
Water
Sand
Heat
Air
Explanation: Only the water evaporates; salt stays behind.
Question 3 of 6
hard
The same water on Earth keeps being used again and again because it…
Never moves
Is newly made daily
Comes from space
Moves round in the water cycle
Explanation: The water cycle reuses Earth's water endlessly.
Question 4 of 6
hard
A raindrop today could have once been part of an ocean long ago. This is possible because water…
Never moves
Is made fresh each day
Is recycled endlessly in the cycle
Comes from the Moon
Explanation: The same water travels the cycle again and again.
Question 5 of 6
hard
Fog is really a cloud that has formed close to the…
Sun
Ground
Moon
Sea bed
Explanation: Fog is a low cloud near the ground.
Question 6 of 6
hard
Hail is special because the falling water freezes into balls of…
Glass
Sand
Salt
Ice
Explanation: Hail is frozen balls of ice.