| A | B |
|---|
| igneous rocks | rocks formed by the solidification from a molten state |
| magma | the molten rock material under the earth's crust, from which igneous rock is formed by cooling slowly |
| lava | molten rock that reaches the earth's surface through a volcano.(Lava cools quickly.) |
| crystallization | a rock formed by solidification of a substance; has regularly repeating internal structure |
| sedimentary rocks | rocks formed by the deposition of sediment |
| weathering | process by which rocks exposed to the weather undergo changes and breaks down |
| erosion | the wearing away and movement of earth material |
| sediment | solid fragments of inorganic or organic material that comes from the weathering of rock and are carried and deposited by wind, water or ice. |
| sand | a sedimentary material with particles larger than silt and sand |
| silt | a sedimentary material consisting of very fine particles intermediate in size between sand and clay. |
| clay | a sedimentary material made of particles smaller in size than silt and sand |
| Pangea | a hypothetical continent including all the landmass of the earth |
| plate tectonics | theory that states that the earth's crust is broken into about a dozen huge chunks, or plates, which are always in motion |
| transformation | the act of changing in form or shape or apearence |
| rock cycle | a series of events through which arock changes, over time, between igneous, sedimentary and metemorphic rock |
| metemorphic rock | a type of rock that forms from existing rock because of changes caused by heat, pressure or chemicals. |
