Human activity is one of them
Answer: a) chunks of the core of a larger asteroid that was shattered by a collision.
Explanation:
The processes meteorites are the large celestial objects that are formed by the collision of large planatery bodies or asteriods. These consists of crust, mantle and core similar to that of the terrestrial planets. These can be define as the fragments of asteroids who have melted interiors in which the heavier metals sank inside the center and the lighter rocks raise to the outer surface. This process of formation of processed meteorites is called as differentiation.
The answer is San Francisco will be warmer than St.Louis in the winter.
