Physical evidence like fossils
and measurements like radiometry or Carbon dating
Answer:
Mt. Kenya is a large fairy symmetrical volcanic cone. Its diameter at the base averages 120 km. It was formed between 2.6 and 3.1 million years ago by eruptions of successive layers of lava and agglomerates from a central vent in the earth's surface.
The answer is: the greater Antilles, the Lesser Antilles and the Bahamas.
The greatest common factor of 100 and 20 is 20!