Start with the one that you know better the beginning of essays are hakf the tine awkward anyway.
When charged particles from the sun strike atoms in earth's atmosphere, it causes electrons to move to a higher energy state. When the electrons drop back to a low energy state they release light photons. This is what causes the Aurora lights
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An oil spill, fertilizer run off, and another thing i could think of is a flood hope this helped :)
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i believe it would be the amount of lemon juice
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This sums up most of them
