question: Asteroids are not geologically active. which is the only way they can change?
distractor3: expansion
distractor1: propulsion
distractor2: combustion
correct_answer: a collision
support: Asteroids are very small, irregularly shaped, rocky bodies. Asteroids orbit the Sun, but they are more like giant rocks than planets. Since they are small, they do not have enough gravity to become round. They are too small to have an atmosphere. With no internal heat, they are not geologically active. An asteroid can only change due to a collision. A collision may cause the asteroid to break up. It may create craters on the asteroid’s surface. An asteroid may strike a planet if it comes near enough to be pulled in by its gravity. Figure below shows a typical asteroid.