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8.E.2.2 EARTH’S CHANGING SURFACE WARM UP Where does sea floor spreading occur? A. where 2 oceanic plates collide B. where an oceanic and continental plate collide C. where 2 oceanic plates move apart D. where two continental plates move apart QUIZ 1. _________ boundary is when 2 plates move away from each other. 2. _________ is when 2 oceanic plates move apart. 3. ________ occurs along the boundary of sea floor spreading. 4. Breaks or cracks in earth’s surface are called _____ 5. Earthquakes occur as a result of _______ boundaries. EARTH’S CHANGING SURFACE What you already know: 2 processes build up earth’s surface: folded mountains and volcanoes BREAKING DOWN EARTH’S SURFACE Weathering- breaks rock into smaller pieces 2 types Mechanical- breaking down rock by physical means (water/wind causes rock to scrape together, plants, and freezing water) Chemical - breaking down rock as a result of chemical reactions (runoff containing chemicals, oxygen reacting to cause rocks to rust, acid rain, BREAKING DOWN EARTH’S SURFACE Erosion- a process by which weathered rock is picked up and moved to new places Agents of erosion: moving water, glaciers, wind, and gravity Water is a major agent: beach erosion, rivers carving valleys BUILDING UP EARTH’S SURFACE Deposition- the dropping of pieces of weathered rock carried by water, wind or ice Deposited material is called sediment Sediment builds up to form landforms Floodplain- wide, flat area of land formed by repeated floods Dune- a hill of sand deposited by wind