You do not say what will harm the earth. The earth is a dynamic planet, if it did not have the processes which cause earthquakes and volcanoes it would be a dead planet.
While earth stays dynamic, constantly active, it is the perfect place for us.
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Nope.... the Earth will still be nere in 100 years. HOWEVER - if we don't do something NOW to preserve and protect our planet from pollution, it will likely be uninhabitable in 100 years ! That said - our sun is estimated to only have about 6,000 years left before it expands to form a 'Red Giant' - at which time, the Earth will be a lifeless, charred cinder !
because that is how long the earth takes to make 1 full rotation on its axis
through nuclear reactions that occur at the core of the sun. it radiates that energy until it reaches the earth.
Until you grade again
Ever since the earth formed, about 4 billion years ago.