The document discusses the Earth's unique characteristics that make it habitable and able to support life. It focuses on three key aspects: the presence of liquid water, heat sources, and the atmosphere. Liquid water is essential for life and was brought to Earth by comets or volcanism. The Earth exists within the habitable zone of the Sun where water can be liquid. Heat sources both internally from the Earth's core and externally from the Sun allow life-sustaining temperatures. The atmosphere supports photosynthesis, regulates gases and temperature, and its existence is due to the Earth's gravity holding it in place.

1. LESSON 4
AS A UNIQUE PLANET
THEEARTH
THEEARTH

2. THE
THE
EARTH'S
EARTH'S
UNIQUE
UNIQUE
CHARACTERISTICS
CHARACTERISTICS
ByTeacher
ByTeacher
Nikki
Nikki

3. LESSON
LESSON
OBJECTIVES
OBJECTIVES
At the end of the
lesson, the students
should be able to
recognize the
uniqueness of the Earth
being the only planet in
the solar system with
properties necessary to
support life.

4. WHYISEARTHTHE
WHYISEARTHTHE
ONLYHABITABLE
ONLYHABITABLE
PLANETINTHE
PLANETINTHE
SOLARSYSTEM?
SOLARSYSTEM?
SHARE WHAT YOU KNOW!

5. LIQUIDWATER
LIQUIDWATER
Life would not have
begun without water.
Is this statement true?
Why?

6. LIQUIDWATER
LIQUIDWATER
Water is the most
abundant molecule in
cells, accounting for 70%
or more of total cell
mass.

7. LIQUIDWATER
LIQUIDWATER
Can our cells function
without water?
CERTAINLY NOT!

8. LIQUIDWATER
LIQUIDWATER
The presence of water
allowed the first
photosynthetic
organisms to thrive.

9. LIQUIDWATER
LIQUIDWATER
Cyanobacteria is an
organism that needs
sunlight, carbon dioxide,
and water to produce
biomass and oxygen.

10. LIQUIDWATER
LIQUIDWATER
Where does water
come from?

11. LIQUIDWATER
LIQUIDWATER
Volcanism
Melting of icy meteors of the
outer regions of the Solar System
that bombarded Earth.
Scientists believe that water on Earth
came from two possible sources:

12. LIQUIDWATER
LIQUIDWATER
Earth is situated in the
HABITABLE ZONE
(GOLDILOCKS ZONE)- the
distance from a star where
liquid water can exist in its
liquid form.

13. LIQUIDWATER
LIQUIDWATER
What will happen if
Earth had been located
a little farther or nearer
to the Sun?

14. LIQUIDWATER
LIQUIDWATER
Water would exist as ice
crystals (if farther from
the Sun) or as part of the
thick atmosphere (if
nearer).

15. HEAT
HEAT
SOURCE
SOURCE

16. HEAT SOURCE
HEAT SOURCE
Heat drives the different
systems necessary to
support life on Earth.

17. HEAT SOURCE
HEAT SOURCE
What are the two sources
of heat on Earth?

18. HEAT SOURCE
HEAT SOURCE
Internal Heating
External Heating
Two Sources of Heat
1.
2.

19. HEAT SOURCE
HEAT SOURCE
Heat coming from the Earth
is caused by plate
movement and volcanism.

20. HEAT SOURCE
HEAT SOURCE
The heat coming from the
sun is in the form of radiation
which enters the Earth.

21. HEAT SOURCE
HEAT SOURCE
Some of the heat from the sun
is trapped by layers of gases
that envelope the Earth known
as the atmosphere.

22. HEAT SOURCE
HEAT SOURCE
The atmosphere is responsible for
the occurrence of the greenhouse
phenomenon, a natural process
which maintains heat.

23. ATMOSPHERE
ATMOSPHERE
The atmosphere is a vital
part of photosynthesis. How
important is photosynthesis
to us and why?

24. ATMOSPHERE
ATMOSPHERE
Photosynthesis ensures
the adequate amount
and flow of gases on
Earth.

25. ATMOSPHERE
ATMOSPHERE
What will happen if
Earth has no
atmosphere?

26. ATMOSPHERE
ATMOSPHERE
Without an atmosphere,
the average surface
temperature would be
below freezing.

27. ATMOSPHERE
ATMOSPHERE
Without an atmosphere,
a planet would receive
an extreme amount of
radiation.

28. ATMOSPHERE
ATMOSPHERE
The existence of an atmosphere
is mainly due to a planet's
gravity which pulls the
atmosphere from being carried
by the solar radiation.

29. HOPEYOUENJOYED
HOPEYOUENJOYED
LEARNING!
LEARNING!
Thankyou!
Thankyou!