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THIS IS FOR 30PTS

Which theory suggested that the earth was once a signle supercontient that gradually that broke up into the contients that we know today

One of the brightest comets of the 20th century was comet hyakutake, which passed close to the sun in early 1996. the orbital period of this comet is estimated to be about 30,000 years. find the semi-major axis of this comet’s orbit. compare it to the average sun-pluto distance and to the distance to alpha centauri, the nearest star to the sun, which is 4.3 light-years distant.

Explain why the rate of urbanisation is in the way it is between developed and undeveloped countries.