click below
click below
Normal Size Small Size show me how
Earth's Materials
Third grade
| Question | Answer |
|---|---|
| igneous | lava that has cooled and hardened |
| sedimentary | pieces of rock that were pressed and cemented together |
| metamorphic | rock changed by heat and pressure |
| humus | soil made up of decayed parts of once-living things |
| sand | soil that has large grains with large spaces between the grains. |
| clay | soil that has very small grains, holds water easily and gets stick when wet |
| silt | soil that has pieces that are smaller than sand and feels like powder |
| hardness | can be determined with a scratch test |
| luster | how shiny or dull |
| texture | the way it feels |
| mold | an opening in a rock that has the shape of a once living thing |
| cast | a mold that has been filled with tiny rocks or mud that harden and take the shape of the once living thing |
| preserved parts/fossils | parts of a living thing such as shells, bones or teeth |