Craters: are the leftovers of an impact. like an open wound on the earth or the moon. Their shape is irregular. the dirt leftover sinks.

• Impact crater, caused by two celestial bodies impacting each other, such as a meteorite hitting a planet
• Volcanic crater or caldera, formed by volcanic activity
• Subsidence crater, from an underground (usually nuclear) explosion
• A maar crater, a relief crater caused by a phreatic eruption or explosion
• pit crater, a crater that forms through sinking of the surface and not as a vent for lava
• Crater lake
• Explosion crater, a hole formed in the ground produced by an explosion near or below the surface