Which statement best explains why earth and the other planets of our solar system became layered as they were being formed

The main mechanism through which the layering happened is gravity: it pulled the heavier, denser material to the center, leaving the less dense material on the surface. 

The material that was on the outside cooled quicker, but this was the result, not the cause. 

The answer is 
2) Gravity caused more-dense material to move toward the center of each planet.

Answer: the philippines has suffered from an inexhaustible number of deadly typhoons, earthquakes, volcano eruptions and other natural disasters. this is due to its location along the ring of fire, or typhoon belt – a large pacific ocean region where many of earth's volcanic eruptions and earthquakes occur.