Earth systems

• The closest estimation of Earth's age is 4.5 billion years old.
• Hydrosphere covers nearly 71% of the Earth’s surface
• In the Earth's surface, 97% of it is salt water and 3% is fresh water
• Atmosphere is the layer of gas that surrounds the Earth
• Features of the Atmosphere:

  • Moderates Earth’s temperature (heat trapping greenhouse gasses)
  • Protects life from harmful UV radiation
  • Responsible for the transport of water from the oceans into the continents
• Weather occurs in the Troposphere, which is the first layer of the atmosphere.
• The ozone layer is found in the Stratosphere
• Mesosphere is the coldest layer where meteors burn
• Thermosphere is the hottest layer with auroras
• Geosphere includes all the elements that form the crust and core of the Earth
• Biosphere comprises all the living components of the Earth
• A large portion of water in the Hydrosphere is composed of saline water found in oceans
• Hot air balloons fly in the Troposphere, which is the first layer of the atmosphere.
• Airplanes and jets are found in the Stratosphere, which is the second layer of the atmosphere.
• 78% of the Earth’s atmosphere is made up of nitrogen
• 21% of the Earth’s atmosphere is made up of oxygen
• They layer of the atmosphere we live in is called the Troposphere
• All living things are part of the biosphere
• What is Earth's largest system? 

  Geosphere
• The gaseous layers of the atmosphere are held to Earth’s surface by gravity
• The 5 layers of the atmosphere are troposphere, stratosphere, mesosphere, thermosphere, exosphere