erosion - Slow change and destruction over time. , weathering - The weather wearing something down / away. , sediments  - Matter / small pieces , sedimentary  - Rocks formed from pre-existing rocks layered together.  , metamorphic  - Uses existing rock to form a new one - by being squeezed together. , igneous  - Formed from molten rock which has cooled. , magma - Hot semi-fluid under the earth's surface. , heat and pressure - Two ways which new rocks can be created. , waterproof - Water can't penetrate. , sample - A small example or amount. ,

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