| A | B |
|---|
| igneous rock | formed from magma or lava |
| metamorphic rock | formed by pressure and heat |
| sedimentary rock | cementing and compacting |
| intrusive | igneous rock formed inside earth |
| extrusive | igneous rock formed outside earth |
| matter | anything that has mass and takes up space |
| element | cannot be separated into simpler substance |
| mixture | physical combining of substances |
| compound | atoms bonded together chemically |
| crust | thin, outermost layer of Earth |
| mantle | layer of earth directly above outer core |
| moho | boundary between crust and mantle |
| lithosphere | solid, topmost part of Earth |
| troposhere | layer of atmosphere closest to Earth |
| stratosphere | extends from troposphere to 50 km above |
| mesosphere | extends from 50 - 80 km above Earth |
| thermosphere | 80 km + above Earth; very hot here |
| ionosphere | 80-550 km above; affected by solar flares |
| exosphere | 550 km +; where satellites orbit |
| rock cycle | changing from one type of rock to another |
