Constructive Forces

Constructive Forces

DESTRUCTIVE FORCES Destructive Forces Weathering and Erosion Weathering-the break down of rock Erosion-the movement of

weathered rock from place to place Types of Weathering Chemical Weathering Physical Weathering

The breaking down of rock The breaking down of

rock as a result of chemicals Destructive Forces Wind erosion weathering

Destructive Forces Water Erosion Weatherin g

Destructive Forces Ice (Glaciers) Weathering Erosion Destructive Forces Ice

Destructive Forces Mount St. Helen-Volcano Destructive Forces Mount St. Helens AFTER the eruption

Destructive Forces Earthquakes Destructive Forces Tornadoes HOW DO WE CONTROL DESTRUCTIVE FORCES?

Destructive Forces Dam Large barriers built across rivers and streams Controls the flow of water

Used for human purposes such as generating Destructive Forces Groin A wall

created to prevent erosion on the beach Destructive Forces Beach Nourishment Sand is

pumped from the ocean floor onto the beach Replaces Destructive Forces Contour Plowing

Plowing in a zig-zag pattern Prevents water from flowing Destructive Forces

Storm Drain Management Drains excess water after storms so less erosion will occur.

Destructive Forces Levee Embankment on the edge of a river Prevents flooding and erosion

CONSTRUCTIVE FORCES Constructive Forces The process of forming NEW land

Constructive Forces Volcanoes Volcanoes-RING OF FIRE

Constructive Forces Earthquakes Constructive Forces Earthquakes Earthquakes-Fault Lines

Constructive Forces Deposition After weathering and erosion occur, the final step is deposition (the sediment is placed somewhere else, forming new land). Erosio n Weatheri

ng Deposition Constructive Forces Deltas

A triangular area at the mouth of a river sediment/debris (rocks, sand, dirt) are deposited Occurs right before the

river goes into a larger body of water New land is formed WHY? Because the water slows down, so

the sediment/debris falls Constructive Forces Sand Dunes New land is formed

Sand is carried in the wind When the wind stops, the sand drops New land is formed when

the sand drops creating sand Constructive Forces Flood Plains New land is

formed A river floods taking sediment/debris (rocks, sand, dirt) with it The water floods onto the

surrounding land When the water recedes, the sediment/debris Constructive Forces Barrier Island

Sand, dirt, and rocks erode of off the main land because of waves The waves deposit the sand,

rocks, and dirt creating an Constructive Forces ongshore Current As a wave hits the

beach the longshore current, pushes it sideways This water then picks up sand/rocks/ dirt and carriers it along the

shore New land is As the wave recedes, it drops the sand/dirt/rocks

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