destructive landform processes break down earth’s surface causing the land to become flat....
TRANSCRIPT
Destructive Landform ProcessesBreak down Earth’s surface causing the land
to become flat. Interactions between hydrosphere,
atmosphere and lithosphere. Weathering and erosion.
WeatheringWeathering is the breaking down of rocks
into smaller pieces. Rain, ice, and atmospheric gases cause this.
Physical weatheringRocks are broken into smaller pieces by
physical agents. Ice wedging. Plant and animal actions. Water
Chemical weatheringBreaking down of rocks due to the chemical
change in their composition. Air and water often cause this. Oxidation (rust) and acid rain.
ErosionThe process that moves rock material at
Earth’s surface and caries it away. Movement of the rock particles.
Causes 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.
Constructive Landform ProcessesProcesses that build up Earth’s surface and
cause the land surface to rise.
DepositionThe process by which eroded material is
dropped off or deposited in a new area. Gravity WaterWindGlaciers Ocean currents
Folding 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.
Volcanic 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.
When volcano’s erupt, they release hot liquid rock called lava.
Lava will harden forming new landforms.
Landforms from ErosionCanyons/valleys
Flowing water removes sediment.
Sea cliffsWaves erode rock making steep cliffs.
Sea caves, arches, and stacks.
Landforms from DepositionFlood plains
Sediments deposited when rivers overflow their banks.
Deltas and Alluvial FansWhen 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.
BeachesArea of shoreline made up of sediment
deposited by ocean currents and waves.
Landforms from Folding and FaultingBlock mountains
Large areas of Earth are forced upwards in a fault.
Rift valleyWhen two pieces of Earth’s surface are
separating from each other.
Folded mountainsWhen the surface of Earth is bent upward
making a mountain.
Landforms from Volcanic ActivityVolcanoes
CalderaA collapsed volcano.
Dome mountainMagma forces the surface of Earth up into a
dome shaped mountain.
Plateau Lava slowly flows from a break in Earth’s
surface, forming a plateau.
PrimetimeWhat are two examples of destructive forces?What are four examples of constructive
forces?Give an example where constructive and
destructive forces work together to create a landform.