1. what causes the northern lights(Aurora Borealis)? Give as much detail as you can.

Aug 24th, 2016
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1. what causes the northern lights(Aurora Borealis)? Give as much detail as you can.2. what is the ozone layer? where is it located? what does it do for us? what was destroying this layer recently (but is now no longer a threat)?3. There are 2 kinds of Earth satellites. what are they? and what is the main benefit of each kind?

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