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No, not everyone celebrates earth day. That would be great, but there are still many who do not celebrate it.
nonthing
Earth
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in the tropics
Have a lower average density.
It would burst up in flames. If earth moved closer to the sun we would all die and suffer of the heat of the sun and also if the earth got closer to the sun earth can most likely melt.
Nickel
It's not likely since there aren't any.
It depends if you're still living in terms with Earth years. ;)
Out of courtesy a Witness would most likely accept it but we do not celebrate it.
You would find metamorphic rock in Earth's crust.