| A | B |
|---|
| Crust | Made of two layers of rock, mantle rock, and bedrock |
| Mantle | Divided into three layers; two solid and one semi-fluid |
| Outer Core | Molten nickel and iron |
| Inner Core | Solid nickel and iron |
| Geologists | Scientists who study the structure of the earth |
| weathering | The process by which new soil is formed as rocks crumble and break into smaller pieces |
| Moho (Mohorovicic discontinuity) | compacted rock forming a boundry between the crust and mantle |
| Magnetism | The pull or force that operates betwen magnets |
| Poles | the ends of a magnet |
| magnetosphere | The magnetic field produced by the earth. |
| magma | Hot, fluid rock found in the earth's mantle |
| Sedimentary | Over 75% of the earth's surface is covered with this type of rock |
| The crust of the earth is divided into a number of ?? | Plates |
| Bedrock | The lower level of the crust is a solid mass of rock called ?? |
| Rocks are composed of one or more inorganic substances called ?? | Minerals |
| The hardest known mineral; found in "pipes" | Diamond |
| The rarest of all gems. | Ruby |
| A bright blue gem found particularly in Australia. | Sapphire |
| A deep green gem from Peru or Columbia | Emerald |
| A precious deep yellow metal, valued by man for its beauty since earliest times | Gold |
| A precious metal with many uses, including dental work and oil refining | Platinum |
| The precious metal that tarnishes easily; used in photography | Silver |
| The most commonly used practical metal; used to make tools. | Iron |
| A metal that is a good conductor of electricity. | Copper |
| A metal that is very strong but lightweight; a substitute for copper and steel | Aluminum |
