# The Water Cycle 2

In this worksheet, students will answer questions about the water cycle in more detail using their understanding of changes of state.

Key stage:  KS 2

Curriculum topic:   States of Matter

Curriculum subtopic:   Water Cycle: Evaporation and Condensation

Difficulty level:

### QUESTION 1 of 10

Here is the WATER CYCLE:

As water moves through the water cycle, it may exist as a solid. liquid or gas. There is water vapour in the air around us, even though we cannot see it until it condenses into water droplets.

Wind and heat cause the droplets to rise up into the air. As the droplets rise, the temperature falls, and the droplets form clouds.

When the air is very cold, the water droplets freeze, and fall as snow. Sometimes, high up on mountains, the snow does not melt because the temperature does not rise above freezing all year round.

However, in other places, melting ice flows down the mountain to create rivers which then flow to the sea.

Use this worksheet to test what you understand about the water cycle.

Match up these changes of state with the correct stage in the water cycle.

## Column B

melting
water changes into vapour
condensing
ice changes to water
freezing
water droplets form clouds
evaporating
snowflakes form

Which TWO of these weather conditions increase the rate of evaporation?

hailstones

strong breeze

sunshine

fog

When evaporation occurs over the seas and oceans, which dissolved material is left behind?

seaweed

sugar

salt

sand

Why is sea water salty?

TWO of these explanations are correct...

it's left over from a previous civilsation

it is washed off the land

dissolved from rocks

it's proof of being visited by peoples from a different planet

Which reversible process separates a mixture of salt and water?

evaporation

evolution

condensing

contracting

How does the temperature change as we travel up into the atmosphere?

it gets warmer

it does not change

it gets cooler

Rain, sleet, snow and hailstones are collectively called...

prediction

perspiration

precipitation

The rainwater which gathers in streams and rivers eventually flows where?

to the sea

up the hills

into the clouds

Which one of these forces acts on the falling rain and water to carry it from high ground to the lowest level (sea level)?

magnetism

gravity

friction

Many scientist are worried about CLIMATE CHANGE.

They predict that the temperature of the Earth will rise.

If this happens, what do you think might happen to the ice at the North and South Poles?

sink

freeze

melt

• Question 1

Match up these changes of state with the correct stage in the water cycle.

## Column B

melting
ice changes to water
condensing
water droplets form clouds
freezing
snowflakes form
evaporating
water changes into vapour
EDDIE SAYS
It's important to nail what these different words mean when we're talking about materials changing state. So, MELTING - that's solid turning to liquid, so it has to be ice changing to water. FREEZING is the opposite: liquid to solid, so that's snowflake formation. When a liquid EVAPORATES it's changing into a gas, so that's water evaporating off the surface of the planet as water vapour. The hardest one is CONDENSING when the vapour cools to become a liquid. For the water cycle that happens high up in the atmosphere, as the water vapour cools to form tiny droplets we call clouds.
• Question 2

Which TWO of these weather conditions increase the rate of evaporation?

strong breeze
sunshine
EDDIE SAYS
Think hair dryer! A strong stream of warm air!
• Question 3

When evaporation occurs over the seas and oceans, which dissolved material is left behind?

salt
EDDIE SAYS
Seaweed and sand are not dissolved in sea water, we can see them clearly. Sea water contains lots of different salts, not just the salt you put on your fish and chips!
• Question 4

Why is sea water salty?

TWO of these explanations are correct...

it is washed off the land
dissolved from rocks
EDDIE SAYS
Over millions of years of the water cycle, salts have been washed off the land into the seas. As the water evaporates, the salts are left behind.
• Question 5

Which reversible process separates a mixture of salt and water?

evaporation
EDDIE SAYS
You can try this for yourself! Make a salty solution and leave it in an open container in a warm, dry place. Check it after a few days!
• Question 6

How does the temperature change as we travel up into the atmosphere?

it gets cooler
EDDIE SAYS
The cooling water vapour condenses into clouds as the temperature falls. If you're ever in a plane at about 30 000 feet up, check the temperature gauge on the screen - it's about minus 50;°C!
• Question 7

Rain, sleet, snow and hailstones are collectively called...

precipitation
EDDIE SAYS
Precipitation - that's a long word to mean stuff falling out of the sky, but it's useful if you don't want to specify what it will be: rain/snow/hail/etc..
• Question 8

The rainwater which gathers in streams and rivers eventually flows where?

to the sea
EDDIE SAYS
The water cycle is just that - it's vital that the water that falls from the sky eventually gets up there again, so it flows down to the sea where it will evaporate to form clouds.
• Question 9

Which one of these forces acts on the falling rain and water to carry it from high ground to the lowest level (sea level)?

gravity
EDDIE SAYS
That makes sense, doesn't it? Gravity is the force that pulls everything DOWN and, of course, it's vital for the water cycle as it ensures that the water flows down to the sea before the vapour rises up into the air.
• Question 10

Many scientist are worried about CLIMATE CHANGE.

They predict that the temperature of the Earth will rise.

If this happens, what do you think might happen to the ice at the North and South Poles?

melt
EDDIE SAYS
If the ice at the poles melts, there will be more water in the oceans! That means that coastal communities will flood and people living on low-level islands will be forced to move.
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