The document discusses several key factors that are necessary to support life on Earth, including the presence of liquid water, ability to maintain heat, and existence of an atmosphere. It notes that cyanobacteria were the first photosynthetic organisms on Earth and produced oxygen through photosynthesis using sunlight, carbon dioxide, and water. The document also discusses how Earth's distance from the sun allows it to maintain liquid water and how the planet's heat comes from radioactive decay and tectonic activity, including volcanism and plate movements.

1. Life on Earth

2. Important Characteristics
that are Necessary in
Supporting Life
-Presence of liquid water
-Ability to maintain heat
-Existence of its
atmosphere

3. Cyanobacteria
-1st photosynthetic
unicellular
organisms to thrive
on Earth

4. -Has used sunlight,
carbon dioxide and
water
-Produced biomass
and oxygen

5. Scientists believed
that water on Earth
came from 2
possible sources:

6. 1. Water released
through
volcanism
2. Water from the
icy meteors

7. Habitable Zone
- Earth’s distance
from the sun
- Allows Earth to
hold water in its
liquid form

8. The heat that drives
the different
systems necessary
to support life on
Earth comes from
2 sources:

9. - Heat coming from
Earth is caused by
the radiogenic
heat from the
radioactive decay
of materials.

10. - It is extruded by
tectonic activities;
* volcanism
* plate
movements

11. - As the radiation
from the Sun
enters Earth,
some of the heat
is trapped by the
atmosphere

12. Without
photosynthesis,
there would be too
much greenhouse
gases that would
cause global
warming

13. Having atmosphere
influences;
- Surface
temperature
- Weather
- Climate

14. Motions
of the
Earth

15. Rotation
- Amount of time
that it takes to
turn around
once on its axis

16. Axis
- Imaginary line
about which a
body rotates

17. Earth’s axis is
tilted 23.5
degrees

18. Two Different
kinds of Rotation:
- Sidereal day
- Solar day

19. Earth rotates on its
axis;
- 23 hours
- 56 minutes
- 4.09 seconds

20. Review for
10
minutes

21. 1. 1st photosynthetic unicellular
organisms to thrive on
Earth
2-4. Needs of plant to make its
own food.
5. (What do you call the zone)
Earth’s distance from the
Sun.

22. 6. Amount of time that it takes
to turn around once on its
axis.
7. Imaginary line about
which a body rotates.
8. Earth’s axis is tilted ___
degrees.

23. 9-10. Earth rotates on
its axis by 23 hours,
_____minutes and
_____seconds