| A | B |
|---|
| mineral | An object that is solid, is formed in nature, and has never been alive |
| rock | A solid made of minerals |
| crust | The solid outside layer of the Earth |
| mantle | The middle layer of the Earth |
| core | The center of the Earth |
| igneous rock | A rock that was once melted rock but has cooled and hardened |
| sedimentary rock | A rock formed from material that has settled into layers and been squeezed until it hardens into rock |
| metamorphic rock | A rock that has been change by heat and pressure |
| rock cycle | The process in which one type of rock changes into another type of rock |
| fossil | Something that has lasted from a living thing that died long ago |
| landform | A natural shape or feature of Earth's surface |
| mountain | A landform on Earth's surface that is much higher than the land around it |
| valley | A lowland area between higher lands, such as mountanins |
| canyon | A deep valley with very steep sides |
| plain | A flat area on Earth's surface |
| plateau | A flat area higher than the land around it |
| barrier island | A thin island along a coast |
| weathering | The process by which rock is worn down and broken apart |
| erosion | The movement of weathered rock and soil |
| glacier | A huge sheet of ice |
| earthquake | The shaking of Earths' surface caused by movement of the crust and mantle |
| volcano | An opening in Earth's surface from which lava flows |
| flood | A large amount of water that covers normally dry land |
| resource | A material that is found in nature and that is used by living things |
| renewable resource | A resource that can be replaced in a human lifetime |
| inexhaustible resource | A resource such as air or water that can be used over and over and can't be used up |
| nonrenewable resource | A resource such as coal or oil, that will be used up someday |
