The best answer for this question would be:
2. Cosmic Background Radiation
The Cosmic Background Radiation are when the heat of a planet is measured by the left over heat of it. This is based on the “Big bang Theory” wherein the planets were formed because it was once a very hot radiation.
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B.) a population density map and c.) a political boundary map
The imaginary line that divides the earth into in this case the north and south hemispheres is called the Equator and it passes through Ecuador and actually Ecuador is the Spanish word for Equator. The French explorer La Condamine spent 10 years in Ecuador studying the equator and determined the oblate spheroid shape of the world.
