The document discusses the atmosphere, hydrosphere, and water cycle on Earth. It notes that the atmosphere is made up of different gases including nitrogen, oxygen, and carbon dioxide. Most of Earth's surface is covered by water, known as the hydrosphere, which exists in liquid, gas, and solid forms. The water cycle involves water evaporating, condensing into clouds, and falling as precipitation. The document emphasizes the importance of protecting the atmosphere and water resources through responsible use of transportation, energy, and water.

1. First part - 3º Social Science

2. 
 Earth is a planet with a very special characteristic: AIR.
 Air is a mixture of gases that living things can breath.
 The atmosphere is the layer of air that surrounds Earth.
 It is the wall and coat to protect us to the sun’s rays.
The layers of the atmosphere
Different gases make
up the air in the
atmosphere.
Nitrogen: the most
abundant gas.
Oxygen: we need it
gas to breath.
Carbon dioxide:
another kind of gases
as water vapour.

3. 
 Most of Earth’s surface is covered by water.
 This layer of water is called the hydrosphere.
 We can find the water in 3 states:
 Liquid water: oceans, seas, lakes…
 Gaseus water: clouds, water vapour
 Solid water: ice, snow
Water on our planet

4. 
The water cycle

5. 
 When we heat our houses, travel by car or use the
fridge, we produce gases that pollute the air. That is
why it is important to use these machines
responsibly.
SOLUTIONS
 Take public transport and walk or use the bike.
 Reduce the use of aerosols.
 Look after the trees.
 Switch-off all the lights and fans when not required.
How to take care of the atmosphere

6. 
 We use water at home, in farming, in industry…
 The only water we can use is fresh water, but it is a
limited resource.
 This is why it is so important to use water
responsibly.
How we can take care of water?

7. 
1) Match the pictures with the correct water phase.
ACTIVITIES
Liquid water
Gaseous
water
Solid water

8. 
2) Complete the table with examples of these types of
water.
ACTIVITIES
SOLID GASEOUS LIQUID

9. 
3) Complete the gaps with the words on the table.
a) The……………….warms the water in rivers, lakes,
seas and oceans.
a) In the air, water vapour condenses and
forms…………….
a) When a cloud is too heavy, its water falls in the form
of ………………… or snow.
ACTIVITIES

10. 
4) Circle the correct option about protect air and water.
ACTIVITIES