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Changes in Climate

How has ice ages change the

  1. During the Ice Ages the sea level drops. Glaciers are rivers of

Earth?

moving ice. When the ice recedes, they carve out very large


holes. When they were filled, they became the Great Lakes.


When glaciers melt, they raise the sea levels and coastal towns


are flooded. The ice age changed the face of the Earth in the past


10,000 to 12,000 years.


 

The Milankovitch Theory

  1. States that the Earth changes the tilt of its orbit in a 100,000 years.


The tilt ranges from 22.2 to 24.5°. When the tilt is 24.5° the poles


receives more energy.


 

Plate Tectonics

  1. When the Pangaea split, some continents migrated to the poles qua


and others went to the equator. That is why there are tropical


fossils of plants and animals at the poles, who were once at the


equator.


 

Volcanic Eruptions

  1. Volcanic ash blocks out the sun causing the Earth to cool and


causes colder winters.


 

Asteroid Impact

  1. Causes debris to encapsulate the Earth blocking out sun light.


All plants and animals die due to the lack of food. This happened


65 million years ago when the dinosaurs became extinct.


 

The Sun’s Cycle

  1. The sun has an 11 year cycle between a solar minimum & a solar


Maximum. During the solar minimum, the sun produces a low


percentage of high – radiation energy. During the solar maximum,


the sun produces a large percentage of high-energy radiation.


7. The excessive amounts of CO2 gases trap heat in the Earth’s

Global Warming

atmosphere, thereby warming Earth’s global temperature.


 


 


 


 


 
Summary of Notes
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