| A | B |
|---|
| Crust | thinnest, least dense layer of the Earth; the layer we live on. |
| Inner Core | layer of the Earth with the most heat and pressure; solid metals like iron and nickel |
| Mantle | Layer just below the crust; 2nd layer;solid rock |
| Pumice | a form of Igneous rock; cooled lava |
| Granite | a form of Igneous rock; cooled magma |
| Sedimentary Rock | sand grains cemented together |
| Coal | mined to use as an energy source |
| Outer Core | 3rd layer; melted metals like iron and nickel |
| magma | layer of melted rock just below the crust |
| plates | large continental sized breaks in the earth's crust |
| 4.6 billion years | the age of the Earth |
| rocks and fossils | used to determine the age of the Earth. |
| fault | the boundary where two plates meet |
| Earthquake | When the Earth's crustal plates (the earth's crust) move |
| Volcano | Surface feature caused by the movement of Earth's plates; studied by scientist to learn the temperature inside Earth |
| Fossils | tell when and where animals lived and what they were like.: The deeper they are found in the Earth, the older they are |
| Bones, Claws, Teeth, shells | Most likely parts of animals to be found as fossils |
| Water, wind, and weathering | causes of land movement, erosion, and changes to rock. |
| erosion | Changes to the earth's surface caused by wind, rain, flow of water |
| Weathering | Causes the formation of sedimentary rock. |
| Planting grass and trees | prevents soil erosion |
| Ocean Pollution | dumping garbage,oil spills, chemical runoff |
| Growing crops | human activity that relies on high quality soil |
| artificial reefs, creating nature preserves | activities that have a positive impact on the Earth |
