Meteors are extremely common in the solar system. Every day, small to medium-sized meteors hit the Earth, but most burn out quickly in the atmosphere without ever reaching the surface. Mars, on the other hand, has a very thin atmosphere and most meteors reach the surface. This is a constant threat and must be taken into consideration when designing colonies.
Domes can mostly withstand direct hits with manageable damage, but all buildings outside its protection are vulnerable. Redundancy in vital lifelines such as water and oxygen support is one way of risk management.
Meteors can leave behind surface metals, Polymers as well as anomalies following an impact. This is more common in high meteor areas, though the risk can outweigh the rewards (or vice versa) depending on chance.