By: Amber Boudrie, Anne Mills, and Logan Hart Story in the Rocks! By: Amber Boudrie, Anne Mills, and Logan Hart

Weathering and Erosion! Weathering is the chemical and physical processes that break down rock on Earth’s surface. Erosion is the process by which water, ice, wind, or gravity moves weathered rock and soil! Gravity- force that pushes down on objects.

Weathering! There are two types of weathering: Chemical involves a chemical change in at least a few minerals. Physical is breaking down rocks into fragments without changing chemically. Sediment is fragments of rocks that come from weathering. These fragments are deposited by wind, water, and ice. Deposition- Process in which sediment is laid down in new locations.

Erosion! The main agent of erosion is running water because the features come directly from the action of running water both on the surface and underground. Eroded material slides downhill by living organisms gravity, wind, water, or ice. Sheet erosion is erosion on sloping farmland in which rain washes away thin layers of top soil.

Difference! Erosion is movement down the slope due to gravity, water, wind, or ice. When a rock goes through weathering it goes through two processes to decompose.

Rock Cycle! The rock cycle is a model that describes the function, breakdown, and reformation of a rock as a result of sedimentary, igneous, and metamorphic processes. The three different ways a rock can form: Igneous- By melting and cooling. Sedimentary-By erosion and weathering. Metamorphic- By heat and pressure.

Igneous! Igneous is a rock that rock that forms from molten rock underground. Erupts out of a volcano and hardens into igneous rock.

Sedimentary! Sedimentary rocks are made from sediments deposited out of water or air, after erosion and weathering. Hardens into rock and forms into layers.

Metamorphic! Metamorphic rock is the alteration of other rocks through temperature and pressure.

Fossils! Fossils are preserved remains or traces of animals, plants, and other organisms from the past. Fossils form when animal remains are buried into rock, mud, tar, volcanic ash, or ice and take millions of years to take shape. Most fossils are sedimentary rock!

Other! The law of superposition is a key axiom (educated guess based) on observations on natural history. The geological time scale is a system of chronological measurement relating various geologic periods and absolute time intervals.

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