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Rock-It! |
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Did you figure out which rock was which?
How close to our table were your results?
| Color | Texture | Luster | Hardness | Reacts to Acid | |
| Sample 1 | solid gray | fine | earthy | medium hard | yes |
| Sample 2 | white, gray, and black | coarse | sparkly | hard | no |
| Sample 3 | white | large crystals | sparkly | soft | yes |
Here come the answers. . .
Sample 1 is limestone because it is gray and reacts to acid.
Sample 2 is granite because it is hard, doesn't react to acid,
and has grains of different colors.
Sample 3 is marble because it fizzes, is soft, and has large crystals.
Use the tests to discover what some of your neighborhood rocks might be.
copyright 2003, Center for Hands-On Learning