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Constructive & Destructive Forces on Landforms







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Constructive & Destructive Forces on Landforms. 5-3.1. Two Types of Forces. Destructive Forces : processes that destroy landforms. 2 types: Slow (weathering) and Fast (Erosion) Ex. landslides, volcanic eruptions, earthquakes, floods
Constructive & Destructive Forces on Landforms

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Slide 1

Constructive & Destructive Forces on Landforms

5-3.1

Slide 2

Two Types of Forces

  • Destructive Forces: processes that destroy landforms.

    • 2 types: Slow (weathering) and Fast (Erosion)

    • Ex. landslides, volcanic eruptions, earthquakes, floods

  • Constructive forces:forces that build up an existing landform or create a new one.

    • Caused by: water, gravity, wind and glaciers.

    • Ex: deposition, landslides, volcanic eruptions, floods

Slide 3

Weathering

Weathering Pictures

  • Weathering: a slow, destructive force that breaks rocks into smaller pieces called sediments. Can by physical (mechanical) or chemical.

  • Keywords:

    wear down, break

    apart

Slide 4

Mechanical weathering:the breaking of rock into smaller pieces by forces due to gravity, ice, plant roots, or other physical forces.

Slide 5

Chemical Weathering: the changing of materials in a rock by chemical processes.

Slide 6

Erosion

Grand Canyon Video

  • Erosion: the destructive movement of materials away from one place by wind, water, ice and gravity.

Wave Erosion- caused by water

Wind Erosion (Dust Storm)

Slide 7

Landslides

  • Landslides: occur when gravity quickly pulls rock and dirt downhill.

Slide 8

Floods

  • Floods: a great flow of water over an area that is usually dry land.

Slide 9

Volcanic Eruptions

  • Volcano: an opening in the Earth’s crust through which steam, lava and ashes erupt.

  • Cause both destructive and constructive changes to landforms.

Slide 10

Mount St. Helens

Mount St. Helens Video

Saint Helen’s Before

Saint Helen’s After

Slide 11

Volcanoes can be constructive, but also destructive…

Slide 12

Earthquakes

  • Earthquakes: the shaking of Earth’s surface caused by the release of energy along a fault.

San Andreas Fault, California

Slide 13

Volcanoes & Earthquakes

Tectonic Plates, Volcanoes & Earthquakes

Slide 14

Erosion & Deposition

  • Deposition: the placing of materials in a new place (constructive force).

  • Ex. Sandbars

Slide 15

Water Erosion & Deposition

  • River Delta- Deposits of sediment at the mouth of the Mississippi River creating new land called a delta.

Slide 16

Wind Erosion & Deposition

  • Sand Dunes- sand is moved by wind

Desert Sand Dunes

Ocean Sand Dunes


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