The document discusses several key factors that make Earth suitable for life. It explains that the Earth's distance from the sun provides a moderate temperature and regulates weather patterns. It also discusses the importance of the atmosphere, ozone layer, water cycle, and gravitational pull in moderating temperatures and supporting life. The document emphasizes that the Earth's conditions are uniquely able to support complex biochemical processes and the evolution of photosynthetic life.

1. THE EARTH
WHAT MAKES EARTH SUITABLE FOR LIFE?

2. ???
•As a human, what is your
role here on Earth?

3. FACTORS WHICH
MAKE EARTH
SUITABLE FOR LIFE

4. DISTANCE OF THE EARTH FROM
THE SUN
• without the Sun's heat and light, the Earth would
be a lifeless ball of ice-coated rocks
• makes it a perfect reason for the life because it
receives the perfect amount of heat and light to
allow life to be created and to support it.
• regulates the temperature of water bodies,
weather patterns and provides energy to the
growth of plants.

5. IMPORTANCE OF LIGHT ON THE
EARTH
• Earth is the only planet that uses the
Sun’s light as useful as a source of
energy.
• That energy is used to convert
elements, by living things, into a
useable form.
• Photosynthesis

6. IMPORTANCE OF EARTH’S ATMOSPHERE
• It is the layers of gases surrounding the earth that consists of
exosphere, thermosphere, mesosphere, stratosphere and
troposphere.
• The air content and favourable atmospheric pressure also supported
life of most creatures.
• The air content of carbon dioxide on the Earth is less than that of
planets like Venus and Mars.
• Hence, the less air content of carbon dioxide helps to moderate the
Earth's temperature and is absorbed by plants during photosynthesis
to produce oxygen.

7. IMPORTANCE OF OZONE LAYER
• Ozone layer is a part of Earth's atmosphere situated in an
area known as the stratosphere, which makes protecting life
on Earth from its potentially harmful effects of shorter
wavelength and highly hazardous ultraviolet radiation (UVR)
from the sun.
• the Sun is the primary source of energy to the Earth, but the
only planet that optimises the amount of heat and light which
is necessary for the life process.

8. FAVORABLE CLIMATIC CONDITION
• The Earth has a suitable climate for the existence of all forms of life because of
moderate amount of carbon dioxide, which is the driving factor for the survival of
life forms.
• The temperature of planet Mercury ranges from 200°c below freezing to 375°c
above. At 375°c, the water would only exist as a gas, and the planet would be
completely dry.
• Venus has a surface temperature of 480°c, which would be much too hot for
anybody to live in.
• Mars, although it can reach 25°c, is usually freezing and can be as cold as -
140°c, a temperature which would freeze blood and water.
• Other planets are colder still.

9. WATER
• Water is very important for life because it contains the
oxygen needed for life and allows life-providing molecules
to move around easily.
• It continually changes its form through the water cycle.
• The process by which water continually changes its form
and circulates between oceans, atmosphere and land is
known as the water cycle.
• The earth is covered by three-fourth of the water. 97.3%
water is saline or salty in oceans and seas, 3% is fresh
water that consists ice-cap, ground water, fresh water
lakes, inland and salt lakes.

10. FORCE OF ATTRACTION (EARTH'S GRAVITATIONAL PULL)
• The Sun's gravitational pull keeps our planet orbiting the Sun and the Earth
firmly hold everything from topography to all forms of life through its
gravitational pull.
• The force of gravity doesn’t just keep us anchored to the ground, but also
affects our biological system.
• Hence, we can say, Earth is the only planet which hosts liquid water on its
surface, allowing for a direct transfer of energy from the sun in order for
photosynthetic life forms to evolve.
• It has unique surface which neither too hot nor too cold for the occurrence of
complex biochemical process.