| A | B |
|---|
| continent | one of the main land masses on Earth such as Asia, Africa or North America. |
| core | Earth's center, made up of a liquid outer core and a solid inner core. |
| crust | the thin outer layer of Earths surface |
| erosion | the process of transporting and wearing away soil and rocks by water, wind, ice or gravity |
| igneous rock | rock formed by the hardening of hot, molten lava |
| landform | a natural formation on Earth's surface such as a valley, plateau, mountain, plain, hill or glacier |
| magma | melted, liquid rock beneath Earth's surface |
| mantle | the semisolid layer of Earth that lies between the crust and the core |
| metamorphic rock | rock formed by exposing igneous or sedimentary rock to extreme heat or pressure |
| plate | a large sheet of rock that makes up part of Earth's crust |
| plate tectonics | the theory that the plates of Earth's crust move due to the movement of magma in Earth's mantle |
| rock cycle | the series of changes that rock undergoes as it shifts between different forms |
| sedimentary rock | rock formed when sediment is compacted |
| volcano | a place in Earths crust where gases, ash, and lava spew onto the surface |
| weathering | the process of wearing away or otherwise changing Earth's surface from exposure to natural forces |
| delta | a triangle shaped area of land formed by sediment at the mouth of a river |
| dune | a mound of sand formed by action of the wind or water |
| earthquake | a sudden shaking of the ground due to plate movement |
| fossil | the remains or traces of a plant or animal that turned to stone over time |
| glacier | a large body of accumulated ice and compacted snow that is found year round |
| island | an area of land, smaller than a continent, that is surrounded by water |
| landmass | an area of land such as a continent |
| levee | a ridge or raised area of land that prevents a river from overflowing |
| sediment | particles of dirt and rock that are carried by water, wind or ice and deposited elsewhere |
