2StandardS 6.2 Topography is reshaped by the weathering of roc and soil and by the transportation and deposition of sediment.
3Anticipatory Set Gravity affecting materials Small board on desk, roll marble down, observe what happensSmall board on desk, roll block down, observe what happensPut sandpaper on board, roll marble down, observe what happensPut sandpaper on board, roll block down observe what happensHow were they different?
4VocabularyErosion- process of natural forces such as water, wind, ice or gravity that weathers a rock and moves it from one place to another.Sediment- small, solid particles from weathered rocksDeposition-laying down sediment in new placesGravity- a force that moves weathered rocks downhillMass movement- any one of the several processes that moves rocks downhill
5Input Mudslide is a good example of erosion It carries soil and gravel downhill after a rainGravity, water, glaciers, waves and winds all cause erosion.The material that is moved by erosion is called sediment.Sediment: rock, soil, plants and animal remains
6InputDeposition- where the agents of erosion deposit or lay down sediment.It changes the land formThis cycle has been occurring for thousands of yearsWeathering, erosion, and deposition act together to wear down and build up Earth’s surface.
7Mass Movement InputIf you were on the top of a hill, sitting on a bike, what is the name of the term that pushes you down the hill without pedaling?GravityGravity causes mass movementDifferent types of mass movementLandslidesMudflowsSlumCreep
8InputLandslide- occurs when rock and soil slide rapidly down a steep slope.They occur where road builders have cut highways through highways and mountains.Mudflows- a rapid downhill movement of a mixtures of water, soil, and rock. The amount of water in a mudflow is higher than a landslide.An earthquake can trigger mudflows and landslides
10Input Slump- a mass of rock and soil rapidly slips down a slope. It moves down in 1 large massOccurs when water soaks the bottom of soil that is rich in clayCreep- very SLOW downhill movement of rock and soil. Result from freezing and thawing of water in cracks under the soil.Creep may tilt objects at spooky angles.