2Destructive Landform Processes Break down Earth’s surface causing the land to become flat.Interactions between hydrosphere, atmosphere and lithosphere.Weathering and erosion.
3WeatheringWeathering is the breaking down of rocks into smaller pieces.Rain, ice, and atmospheric gases cause this.
4Physical weatheringRocks are broken into smaller pieces by physical agents.Ice wedging.Plant and animal actions.Water
5Chemical weatheringBreaking down of rocks due to the chemical change in their composition.Air and water often cause this.Oxidation (rust) and acid rain.
6ErosionThe process that moves rock material at Earth’s surface and caries it away.Movement of the rock particles.
7Causes of erosion… Gravity-landslides/rockslides. Running water-rivers form canyonsGroundwater-underground water forms caves/cavernsGlaciers-rocks are carried under a glacier.Wind-rock particles are blownOcean currents-sand is moved along a beach by waves.
8Constructive Landform Processes Processes that build up Earth’s surface and cause the land surface to rise.
9DepositionThe process by which eroded material is dropped off or deposited in a new area.GravityWaterWindGlaciersOcean currents
10Folding and FaultingForces in Earth’s surface caused by the movement of Earth’s plates squeezes and bends the surface of Earth.Folding occurs when the crust is bent upward or downward.Faulting occurs when the crust is actually broken.
11Volcanic ActivityThe movement of liquid rock underground and on earth’s surface.Magma is hot liquid rock beneath the Earth’s surface.Magma is less dense than solid rock so it rises to the surface.This forms a volcano.
12When volcano’s erupt, they release hot liquid rock called lava. Lava will harden forming new landforms.
13Landforms from Erosion Canyons/valleysFlowing water removes sediment.
16Landforms from Deposition Flood plainsSediments deposited when rivers overflow their banks.
17Deltas and Alluvial Fans When a stream flows into a large body of water (lake/ocean) or onto land, it deposits sediment in a fan shape.Delta-fan shaped pattern in a lake or ocean.Alluvial fan-fan shaped pattern on land.