7 questions · Four answers, and only one is true. Can you spot it?
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Question 1 of 7
Why is the sea salty?
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They carry it to the sea; the water then floats away as vapour and leaves every grain behind.
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No one could ever have carried that much salt — enough to bury the land.
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Rain is fresh water; you can drink it.
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The sea was salty long before there were any fish in it.
Show the answer
- A They carry it to the sea; the water then floats away as vapour and leaves every grain behind.
- B No one could ever have carried that much salt — enough to bury the land.
- C Rain is fresh water; you can drink it.
- D The sea was salty long before there were any fish in it.
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Question 2 of 7
Why do some things float and others sink?
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A huge ship floats and a small pebble sinks.
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A wooden spoon floats, but so does a steel bowl.
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A heavy ship floats — what matters is heavy for its size.
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Water pushes up on everything — which is why hollowing a lump of steel into a bowl makes it float.
Show the answer
- A A huge ship floats and a small pebble sinks.
- B A wooden spoon floats, but so does a steel bowl.
- C A heavy ship floats — what matters is heavy for its size.
- D Water pushes up on everything — which is why hollowing a lump of steel into a bowl makes it float.
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Question 3 of 7
Why does ice float?
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Water pushes up on everything the same — it is the ice that changed.
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Most things shrink when they harden; water is the odd one out.
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A cold stone sinks just as fast as a warm one.
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Even perfectly clear ice with no bubbles in it floats.
Show the answer
- A Water pushes up on everything the same — it is the ice that changed.
- B Most things shrink when they harden; water is the odd one out.
- C A cold stone sinks just as fast as a warm one.
- D Even perfectly clear ice with no bubbles in it floats.
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Question 4 of 7
What makes rivers flow?
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The sea does no pulling; the river arrives because down is that way.
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A river runs on a windless day, and even straight into the wind.
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The water was flowing long before any fish arrived.
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Rain falls on the hills, gathers into streams, and slides all the way down to the sea.
Show the answer
- A The sea does no pulling; the river arrives because down is that way.
- B A river runs on a windless day, and even straight into the wind.
- C The water was flowing long before any fish arrived.
- D Rain falls on the hills, gathers into streams, and slides all the way down to the sea.
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Question 5 of 7
What lives at the bottom of the sea?
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Deep-sea animals are strange ones that never come up.
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Plants need sunlight, and none reaches down there.
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It is dark, but it is full of life.
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Their food drifts down from far above, like a slow snow.
Show the answer
- A Deep-sea animals are strange ones that never come up.
- B Plants need sunlight, and none reaches down there.
- C It is dark, but it is full of life.
- D Their food drifts down from far above, like a slow snow.
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Question 6 of 7
Why are there waves in the sea?
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The sea is cold, and waves cross it in winter too.
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The water itself mostly stays where it is; only the shape moves on across it.
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Waves roll on across seas far too deep and empty for that.
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Watch a floating gull: it bobs up and down and stays put.
Show the answer
- A The sea is cold, and waves cross it in winter too.
- B The water itself mostly stays where it is; only the shape moves on across it.
- C Waves roll on across seas far too deep and empty for that.
- D Watch a floating gull: it bobs up and down and stays put.
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Question 7 of 7
Where does tap water come from?
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No pipe reaches a cloud; the rain has to fall first.
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The waterworks cleans water, it does not create it.
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Sea water is far too salty to drink.
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It waits in lakes or underground first. That water is millions of years old — a dinosaur may have sipped it.
Show the answer
- A No pipe reaches a cloud; the rain has to fall first.
- B The waterworks cleans water, it does not create it.
- C Sea water is far too salty to drink.
- D It waits in lakes or underground first. That water is millions of years old — a dinosaur may have sipped it.
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