| A | B |
|---|
| amber | Hardened tree sap. |
| cast | A kind of fossil formed when a fossil mold is filled with minerals. |
| extinct | When all the living things of one kind have died out. |
| fossil | A body part or trace of a living thing from long ago. |
| gemstone | A mineral that can be cut and polished for use in jewelry. |
| hardness | A physical property that tells how hard a mineral is and how easy it is to scratch the mineral. |
| igneous rock | A kind of rock that forms when hot melted rock material cools and hardens. |
| luster | A physical property that tells how light bounces off a mineral. |
| metamorphic rock | A kind of rock that forms when rocks are changed by heat and pressure. |
| mineral | A solid non living material found in nature; the building blocks of rocks. |
| mold | A kind of fossil that is a hollow space in rock by the body parts of a living thing. |
| ore | A mineral that is mined for the valuable materials. |
| rock | A natural solid made of one or more minerals. |
| rock cycle | All the ways rock and rock material can be changed. |
| sedimentary rock | Rock that is made from layers of sediment pressed together and naturally cemented. |
| streak | A physical property that tells the color of a mineral's powdered form. |
