Igneous Rocks - Made by the cooling of molten rock which has solidified., Metamophic Rocks - Formed from other rocks by heat or pressure., Sedimentary Rocks - These are formed in layers, with the oldest rocks at the bottom., Physical Weathering - When processes like wind, rain or waves effect the rock., Biological Weathering - When plants break up rocks with roots., Chemical Weathering - The erosion or disintegration of rocks., Erosion is... - When materials are worn away by natural forces., Weathering is... - The breaking down of rocks and minerals into smaller pieces., A grain - A small piece of a mineral which makes up a rock., A Mineral - A solid substance which is round inside rocks., Desposition - The settling of rock fragments after transportation., Transportation - Movement of rock fragments from one place to another.,

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