1. The Atmosphere The Lithosphere The Hydrosphere The Biosphere
The Spheres of Earth
The Atmosphere
The Lithosphere
The Hydrosphere
The Biosphere

2. The Spheres of Earth
When viewed from near, you can see that Earth is surrounded by a thin gas layer swirling with clouds. This represents one Sphere of Earth – the Atmosphere.
The three Spheres of Earth which allow for life are:
Atmosphere
Lithosphere
Hydrosphere

3. The Spheres of Earth
Unlike the Moon, Earth’s gravity is so strong, it is able to hold gases close to the surface.
Why is Earth’s gravity more than the Moon’s?

4. The Atmosphere
Earth’s atmosphere is the layer of gases extending upward for hundreds of kilometers.
It is made of about 78% nitrogen gas (N2), 21% oxygen gas (O2) and the remaining 1% is argon, water vapour, CO2, etc.

5. The Atmosphere Is critical to life on Earth It acts like a blanket
providing us with moderate
temperatures, protecting
us from solar radiation,
and ultraviolet light
Without it we couldn’t
survive

6. The Lithosphere
Is the rocky outer shell of Earth containing the rocks and minerals that make up mountains, ocean floors and the land
It ranges from 50 – 150 km in thickness

7. The Hydrosphere All the water on, above and below Earth’s surface
Includes all oceans, lakes, ice, groundwater, and clouds

8. The Biosphere
Describes the locations in which life can exist within the lithosphere, atmosphere and hydrosphere including several kilometers below the Earth’s surface

9. Bill Nye - Atmosphere