Scince pictures of relative dating

The craters on all of the moons except Io, Mercury, and most of the ones on Mars are from impacts.The kinetic energy of the impacting meteorite or asteroid is converted into heat, sound, and mechanical energy---the projectile explodes on impact.This assumes, of course, that the cratering rate has been fairly constant for the last few billion years.The heavy bombardment of about 3.8 billion years ago must be taken into account when using the crater age dating technique.

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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. Select the photographs to display the original source in another window.There are still small chunks of rock orbiting the Sun left over from the formation of the solar system.The last stage of that "sweeping up", called the occurred from about 4.1 to 3.8 billion years ago.Impacts as large as the one that led to the demise of the dinosaurs in much more recent history were happening about once a month.

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