What is the definition of an impact crater?
An impact crater is a crater, meaning a depression in the ground, which results from an impact, meaning a violent collision of some object with the ground at that location. Generally, such collisions are the result of meteor impacts or other impacts of one object in space on another. Many more impact craters are visible on the moon than on Earth, because on Earth such craters are eventually eroded away by weather and other erosive forces, whereas they tend to be undisturbed on the moon.
