The document summarizes the composition and structure of Earth. It is divided into four interconnected spheres: the atmosphere, hydrosphere, lithosphere, and biosphere. The atmosphere is composed primarily of nitrogen and oxygen and contains weather and protects the planet. The hydrosphere includes all water on Earth, both liquid and frozen. The lithosphere is the solid crust and interior of the planet. Finally, the biosphere contains all living organisms on Earth.

1. Composition of
EARTH

2. Earth Is Divided Yet Connected

3. *The Earth is divided into
4 “Sub-systems” or
“Spheres” namely:
 ATMOS(Gaseous)-
SPHERE.
HYDRO(Water)-
SPHERE
LITHOS(Rock)-SPHERE
BIOS(Life)-SPHERE
*They are interdependent
and function as a whole.

4. *The layer of gas
surrounding Earth’s
surface.
*This is the Earth’s
sphere that supports
life.
*This sphere regulates
the climate.
*It acts both as a
blanket and a filter.

5.  Earth’s atmosphere is a
mixture of gases, mostly
nitrogen and oxygen, with
smaller amounts of Argon,
Carbon dioxide, and other
gases.
Contains most clouds and weather.
Contains ozone that absorbs much of the Sun’s
ultraviolet radiation.
The coldest part of the atmosphere. It can get
down to -90°C in the mesosphere
This is layer of atmosphere we see in images
outside Earth

6. The solid part of the earth.

8. 4. Crust
3. Mantle
2. Outer core
1. Inner core

9. It is composed of all the
water found on under and
over the surface of the
planet. (Including different
bodies of water.)
This sphere covers about
70% of the surface of the
Earth and is the home for
many plants and animals.

10. Most of Earth's water is salty
and in the oceans - about
97%.
Two-thirds of the remaining
3% is frozen in glaciers and
polar ice caps.
Only 1% of the hydrosphere is liquid
freshwater, and even most of this
exists as groundwater down in the
soil

11. It is composed of all of the living organisms on
the planet. This includes all of the people,
plants, animals, bacteria, fungi and single-
celled organisms found on Earth.

13. 70% of the Earth’s
surface is covered in
water
Earth is mostly iron,
oxygen and silicon
Earth doesn’t take 24
hours to rotate on its
axis
The Earth's core is
about as hot as the
sun.
The Earth was once
believed to be the
center of the universe.
Earth has relatively few
visible impact craters
compared with other solid
bodies in our solar system