What is air? Facts about air. Problems and solutions.

1. Block 4 – Lesson 1

3. Air is a mixture of
gases such as
nitrogen, oxygen,
carbon dioxide, neon
and helium. It also
has some small solid
particles in
suspension, called
environmental dust.

5. Air is everywhere,
not only in the
atmosphere but also
in the soil and water.
It allows us to hear
sounds, feel heat or
cold, burn a fire,
breathe, and for
plants to do
photosynthesis.
There is life on Earth
thanks to air.

6. Air forms a layer around the Earth. It is a gas
impossible to touch, but possible to feel when it
moves. Earth’s rotation and revolution together
with sunlight produce wind.

7. Air forms a layer around the Earth. It is a gas
impossible to touch, but possible to feel when it
moves. Earth’s rotation and revolution together
with sunlight produce wind.

9. Human activities are polluting air with toxic gases
from industries, transportation and homes. These
gases accumulate in the atmosphere and affect
the first layers that protect the Earth: the
troposphere and ozonosphere.

11. The solution to this problem is found in small
individual actions:
• Use energy saving light bulbs.
• Use alternative means of transportation such
as bicycles to avoid carbon dioxide emissions.
• Substitute the energy produced by fossil fuels
like: petroleum and coal with renewable forms
of clean energy, like Hydraulic, Eolic and Solar.
• Use Biofuels.

13. 1. What is Eolic energy?
a) It’s the energy generated by the water.
b) It’s the energy generated by heat.
c) It’s the energy generated by the wind.
d) It’s the energy generated by the Sun.

14. 1. What is Eolic energy?
a) It’s the energy generated by the water.
b) It’s the energy generated by heat.
c) It’s the energy generated by the wind.
d) It’s the energy generated by the Sun.

15. 1. What machine produces Eolic energy?
a) The wind mill.
b) The wind turbine.
c) The dam.
d) The solar panel.

16. 1. What machine produces Eolic energy?
a) The wind mill.
b) The wind turbine.
c) The dam.
d) The solar panel.

17. 1 What is Hydraulic energy?
a) It’s the energy generated by water.
b) It’s the energy generated by heat.
c) It’s the energy generated by the Sun.
d) It’s the energy generated by the wind.

18. 1 What is Hydraulic energy?
a) It’s the energy generated by water.
b) It’s the energy generated by heat.
c) It’s the energy generated by the Sun.
d) It’s the energy generated by the wind.

19. 1. What structure produces Hydraulic energy?
a) The wind mill.
b) The wind turbine.
c) The dam.
d) The solar panel.

20. 1. What structure produces Hydraulic energy?
a) The wind mill.
b) The wind turbine.
c) The dam.
d) The solar panel.

21. 1 What is Solar energy?
a) It’s the energy generated by water.
b) It’s the energy generated by heat.
c) It’s the energy generated by the Sun.
d) It’s the energy generated by the wind.

22. 1 What is Solar energy?
a) It’s the energy generated by water.
b) It’s the energy generated by heat.
c) It’s the energy generated by the Sun.
d) It’s the energy generated by the wind.

23. 1. What machine produces Solar energy?
a) The wind mill.
b) The wind turbine.
c) The dam.
d) The solar panel.

24. 1. What machine produces Solar energy?
a) The wind mill.
b) The wind turbine.
c) The dam.
d) The solar panel.

25. 1 What is Thermal energy?
a) It’s the energy generated by water.
b) It’s the energy generated by heat.
c) It’s the energy generated by the Sun.
d) It’s the energy generated by the wind.

26. 1 What is Thermal energy?
a) It’s the energy generated by water.
b) It’s the energy generated by heat.
c) It’s the energy generated by the Sun.
d) It’s the energy generated by the wind.