Paxton was working on a poster of the sea-flooring spreading process. He began with mid-ocean ridges and ended with ocean trenches. Which best describes the order of the ages of the rock on his poster? Choices: The poster begins with the youngest rock and ends with the oldest The poster shows different stages of rock whose relative age can't be determined All the rock stages shown on the poster are the same age The poster begins with the oldest rock and ends with the youngest rock