Erosion and Deposition Forces wear down and build up Earth’s surfaces Water erosion and a farm field

Natural Forces move and deposit sediments The Grand Canyon was formed by the movement of water Water flowed over the land and carried away weather rock and soil This shaped a valley where water flowed creating the canyon

Erosion and Deposition Erosion- weathered particles are picked up and moved to a new place Deposition- the part of the erosion process in which sediment is placed (deposited) in a new location

Gravity Gravity is the force holding everything down on Earth This force causes water to move downward (think from the top of a mountain to the bottom) In the process it carries and deposits sediment in new places

Three types of Erosion Water erosion- rivers, streams carry sediment and deposit sediment at river bottom, floodplain, and mouth of the river Wind erosion- Strong winds life tiny particles of dust and carry them long distances Ice erosion- As ice moves slowly it carries with it rock and soil particles frozen inside of the ice

Valleys and Floodplains As streams flow and carry sediment from the surface of the land they form valleys Floodplain- area of land on either side of the stream that is underwater when the stream floods.

Alluvial Fans and Deltas Alluvial Fan- fan-shaped deposit of sediment at the base of a mountain formed from a stream Delta- an area of land formed by the buildup of sediment at the end (mouth) of a river

Waves and Wind Shape the Land What natural force created these isolated stone pillars? The movement of water (waves). The constant action of waves breaking against the cliffs slowing wore the rock cliff away

Sand Bars and Barrier Islands Sandbar- a ridge of sand built up by the action of waves → ← Barrier Islands- a sandbar that builds up over time creates a long narrow island parallel to the coast

Mechanical Weathering

Weathering Photograph Analysis Take time to view each photograph,  have a conversation with your group to classify the picture as mechanical or chemical weathering and then answer the questions below for each picture.