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Become a nitrogen atom in the nitrogen cycle in our Traveling Nitrogen Classroom Activity Kit/Game. See all our games, activity kits and classroom activities.
This is an image of the Martian dunefields.
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NASA

What causes a Planet's surface to change?

Over the course of time there are many things which can cause the surface of a planet to change its appearance.

In their earliest histories, every planet & moon was hit with the leftover material from their start. If a planet's surface does not show many craters it is younger because it was not around while the planet was being hit. If the planet's surface still shows many craters, they are left over from it's beginning, and the surface is very old.


Last modified April 26, 2001 by Jennifer Bergman.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA