Things You'll Need
Self-hardening or air-dry clay
Genuine moon rocks are filled with craters and resemble volcanic rocks. However, the chances of finding real moon rocks here on earth are pretty slim. Authentic moon rocks are highly sought after because they are rare and so difficult to find. According to Highlights Kids, the Apollo astronauts brought back about 840 pounds of moon rocks from their mission to the moon. While those are difficult to come by, you can make your own version of moon rocks.
Spread old newspaper out over your work area.
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Fill a bowl with tepid to slightly warm water.
Prepare the clay. Use brown or gray air-dry clay and start molding it with your hands. Use the water to moisten and soften it so it is pliable and more workable.
Begin plastering your tennis ball with the clay. Cover the entire ball, but don't give it an entirely smooth surface. Create a bumpy texture.
Add texture to the surface. Take a pencil and use the eraser end to poke holes in the clay. Or, use the cap of a marker or other round object to make holes. Do this in a haphazard manner to create craters in the clay.
Let the clay thoroughly dry out. Follow the manufacturer's directions regarding dying times.
Seal the clay. Use an acrylic glass or sealer. You can find this type of product at any craft or hardware store. Apply the glaze with a clean sponge brush. Coat the entire surface evenly. Let it dry.
Use a tennis ball or any other round object that you don't need for any other purpose. Make sure the surface of your object is rough so the clay will stick to it.
Use only self-hardening or air-dry clay so you don't have to bake your rocks. Polymer clays often require heat to thoroughly dry and set.