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Also the pressure from the surrounding solid rock squeezes the molten rock upward.

Molten rock contains trapped gases that expand as it rises causing it to rise even faster.

Earth has over 170 impact craters on its continents with the 1.2-km diameter Meteor Crater in northern Arizona being one great, well-preserved example.

Even Venus with its thick atmosphere has impact craters, though they all have diameters measured in kilometers because smaller projecticles burn up in its atmosphere.

The first frame of a 3D movie flyover of Tycho Crater on the Moon as seen by Kaguya. It displays the classic terraced crater walls and central peak of a complex crater.

Select the image to go to the Selene website for a great flyover of the crater.

Most of the impact basins---craters measured in hundreds of kilometers---were made during this time.

It is noteworthy that about the time the heavy bombardment ended, life took hold.

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At a minimum crater-age dating can tell you the ages of surfaces (which surface is older than another).Victoria Crater on Mars as seen by the Mars Reconnaissance Orbiter. It is a simple crater that has been partially filled in with sand---note the sand dunes on its floor.If you download the full-resolution version of this picture from the link on the picture, you will be able to see the rover, Opportunity next to the top left crater rim.The rock on the surface of the planet or moon is bent backward, upward, and outward so the amount of material ejected is much larger than the projectile.Large craters will have a central peak formed by the rock beneath the impact point rebounding upward and they may also have terracing of the inner walls of the crater from the collapsing of the crater rim inward.

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