1. Earth

2. The Earth from Space

3. Earth’s Dimensions Radius – 3,827 miles
Mass – 6,000,000,000,000,000,000,000,000 kg
Distance from the sun -93,000,000 miles
Age – 4.8 billion years (4,800,000,000)

4. Structure of the Earth
Biosphere – All parts of the Earth that work together to sustain life
Interior Structure of the Earth
Surface of the Earth
Lithosphere
Continents and the ocean floor
Hydrosphere
Water
Atmosphere

5. Earth’s Interior 3 Layers Crust Mantle Core
Floats on top of the mantle
Mantle
Composed of rock
Core
Inner – solid iron
Outer – molten rock

7. Earth’s Structure Lithosphere The crust and the uppermost mantle
Hard, rigid and brittle

11. Hydrosphere All water on the surface of the Earth
71% of Earth’s surface is water
98% of all water is in the ocean
1% of water is in polar ice-caps
> 1% in rivers, streams, lakes and groundwater

12. Atmosphere Less than .01% of the mass of Earth Structure Troposphere
Most dense layer
Responsible for weather
Stratosphere
Highest level used by humans
Planes fly here….why??
Mesosphere and Thermosphere
The two outermost layers of the atmosphere

13. Atmosphere Composition
78 % Nitrogen
21% Oxygen
> 1% H2O and CO2
This was not the original composition of Earth’s atmosphere. What do you think the atmosphere was like 4 billion years ago?
What changed?

15. Biosphere Where life exists on Earth Some statistics on life
Includes all litho, hydro and atmosphere
Some statistics on life
1.5 Million Species cataloged (estimate of 3 million still not known to science)
50% of all known species are insects
About 4,000 species of mammals
More small organisms than large