GREENHOUSE EFFECT GRADE 7

1. Nitrogen
, 78%
Oxygen ,
21%
Other
gases, 1%

3.  Define greenhouse effect
 Relate the concept of greenhouse to the
increasing temperature of Earth’s
atmosphere
 Recognize the importance of
greenhouse effect for living things
Objectives:

4. A greenhouse is used by commercial
plant growers to protect plants from
harsh weather conditions and insect
attack. Aside from that, it is also use to
trap the energy from the sun that can
be use by plants in photosynthesis.
What is a ‘greenhouse’?

6. Greenhouse allows sunlight to
enter but prevent heat from
escaping.
What does a ‘greenhouse’ do?

7. The process by which the Earth’s
atmosphere warms up by means
of greenhouse gases which
absorb heat energy from the sun
and prevent heat from leaving
our atmosphere
What is the Greenhouse Effect?

9.  Greenhouse gases include carbon dioxide,
water vapor, methane, and ozone.
 They allow sunlight to pass through but
they absorb the energy coming from the
Earth’s surface, keeping the Earth’s
temperature suitable for life.
What are ‘greenhouse gases’?

10.  Good: The greenhouse effect warms the
Earth, without it, the Earth would be very
cold, too cold for living things, such as
plants and animals.
 Bad: It is bad when there are too many
greenhouse gases and the climate gets
warmer (GLOBAL WARMING)
Is the ‘Greenhouse Effect’ Good
or Bad?

12. The small amount of carbon dioxide on
Earth’s atmosphere gives the right
temperature for living things to survive.
With the high surface temperature of
Venus due to its high carbon dioxide
concentration, life forms like those we
know of could not exist there.

13. Carbon Dioxide Measurement in
Mauna Loa Observatory, Hawaii

14. Carbon dioxide - comes from the burning
of fossil fuel such as coal, crude oil and
natural gas.
Methane - comes from animals as they
digest their food, from buried waste and
decaying matter in wet rice fields.
What causes an increase in
greenhouse gases?

15. Chlorofluorocarbons or CFCs - have
been used in spray cans as
propellants, in refrigerators as
refrigerants, and in making foam
plastics as foaming agents.
What causes an increase in
greenhouse gases?

18. An increase in average global
temperatures.
It is caused by an increase in
Greenhouse Gases in the
atmosphere.
What is Global Warming?

20. 1. It is the most abundant gas in the
atmosphere
2. It is used by plant growers to trap the
energy from the sun that can be use
by plants in photosynthesis.
3. The process by which the Earth’s
atmosphere warms up by means of
greenhouse gases

21. 4. It comes from the burning of fossil fuel
such as coal, crude oil and natural gas.
5. It comes from animals as they digest
their food, from buried waste and
decaying matter in wet rice fields.
6. It is used in spray cans as propellants,
in refrigerators as refrigerants, and in
making foam plastics as foaming
agents.