Deposition Erosion and Weathering,

© Kesler Science, LLC

Weathering, Erosion and DepositionPresented by Kesler Science

Vers. 8/20


Weathering, Erosion, and Deposition

Essential Questions:

Reflect on the Essential Questions before you dive in…

1. If you were quizzed today, which questions would you know the answers to already?

2. Which questions would you need to learn more about to answer confidently?

1. What effects does weathering have on the environment in ecoregions?

2. What effects does erosion have on the environment in ecoregions?

3. What effects does deposition have on the environment in ecoregions?

I would know…

I would need to learn…

http://dontchangethislink.peardeckmagic.zone?eyJ0eXBlIjoiZnJlZWhhbmREcmF3aW5nIiwiZHJhZ2dhYmxlcyI6W3siaWQiOiJkcmFnZ2FibGUwIiwidHlwZSI6Imljb24iLCJpY29uIjp7ImlkIjoiZGVmYXVsdC1jaXJjbGUifSwiY29sb3IiOiIjRDUxRDI4In1dLCJkcmFnZ2FibGVTaXplIjoxMi41NSwiZW1iZWRkYWJsZVVybCI6Imh0dHBzOi8vIiwiYW5zd2VycyI6W119pearId=magic-pear-shape-identifier

http://dontchangethislink.peardeckmagic.zone?eyJ0eXBlIjoiZ29vZ2xlLXNsaWRlcy1hZGRvbi1yZXNwb25zZS1mb290ZXIiLCJsYXN0RWRpdGVkQnkiOiIxMDgxOTgwNDQ0MDc5MTk1MTU2NzkiLCJwcmVzZW50YXRpb25JZCI6IjFISFAwZmVfeW5lOGpPWEYySUNZR2s3dnN5N2lYOXQ3S0ZWQmV3bWZ0WEFvIiwiY29udGVudElkIjoiY3VzdG9tLXJlc3BvbnNlLWZyZWVoYW5kRHJhd2luZyIsInNsaWRlSWQiOiJwMiIsImNvbnRlbnRJbnN0YW5jZUlkIjoiMUhIUDBmZV95bmU4ak9YRjJJQ1lHazd2c3k3aVg5dDdLRlZCZXdtZnRYQW8vYjIzYzRmOGEtZTY5OS00ZDVlLTkwZWYtNmZlMDNlYjRkNmRlIn0=pearId=magic-pear-metadata-identifier


Weathering, Erosion, and DepositionWeathering • Chemical and physical breakdown of rocks into sediment

• Occurs when the rock’s environment changes and the rock is exposed to some form of water and the air

When does weathering happen?



Weathering, Erosion, and Deposition Chemical WeatheringChemical change within the rock’s minerals breaking down the bonds holding the rocks together, causing them to fall apart into smaller pieces.

How does chemical weathering break the rock into smaller pieces?

Chemical weathering breaks rock into smaller pieces by…



Weathering, Erosion, and DepositionChemical Weathering Causes Rock to Break

A. OxidationIron combines with oxygen

making rust.

C. Carbonation Carbon dioxide in rainwater

creates carbonic acid. Ex. acid rain, cave creation

B. Hydrolysis Water softens minerals in rocks.


Quick Action: INB


Oxidation Hydrolysis Carbonation

Place the correct description under each type of chemical weathering.

water softens minerals in

rocks

iron combines with oxygen to

make rust

carbon dioxide in rainwater

creates carbonic acid



Weathering, Erosion, and DepositionPhysical (Mechanical) Weathering• The process that breaks rocks apart without changing their chemical composition caused by:

• A. Glacial/Ice:• (A1) Abrasion - by rapidly

moving water, glaciers or wind

• (A2) Ice wedging - by freezing and thawing (contracting and expansion)

A1 A2

Abrasion Contraction Expansion



Weathering, Erosion, and DepositionPhysical Weathering Causes Rock to Break

C. Burrowing

animals scrape and dig

the terrain

E. Gravityfalling rocks or debris, compression

D. Temperature Changecold to hot expanding and contracting

B. Plant Rootsgrow into cracks and

break apart rock

Quick Action: INB


Glacial - Abrasion Glacial – Ice Wedging Plant Roots

Temperature Change Gravity Burrowing

Place the correct description under each heading.

roots grow into cracks and break rocks

freezing and thawing of

water

scraping by rapid ice

movement


expansion and contraction from heat

falling rocks and

compression

scraping by rapid ice

movement



Think About It


Jackie bought a large concrete flower container for her yard. The salesperson recommended that Jackie add a waterproof liner or sealer/paint before she uses it.

Why would that be a good recommendation?It would be good to add a waterproof liner to prevent the flower container from cracking if…



Weathering, Erosion, and Deposition ErosionThe process that moves bits of rock or soil from one place to another by:• Gravity• Water (rivers, waves)• Wind • Ice (glaciers)

How does erosion move rock or soil?

Erosion moves soil by


Quick Action: INB


Gravity Glacial (Ice) Wind Water

Find the matching pieces, then place them together in the correct category of erosion.



Weathering, Erosion, and DepositionDeposition• The process in which sediments, soil, and rocks are added to a landform such as: • Deltas• Flood plains• Sandbars• Dunes


Weathering, Erosion, and Deposition DepositionOccurs when the forces moving sediments are no longer able to overcome the forces of gravity and friction.

What is deposition?

Deposition is when…


Think About It


Part of the sand for beaches comes from rocks nearby that have been weathered down. The sediment is deposited at the beach. The sediment is moved away when beaches are eroded. If all the rocks in the area weathered away, how would the beach change?

If all the rocks weathered away, the beach would…




• Running water is the primary agent of erosion.

• Velocity (speed) depends on gradient (slope) and discharge (amount of water).

• As velocity increases, the size of particles carried also increases.

What affects transportation of sediments?

In the picture on the left, what part of the river has the greatest erosion happening?

The greatest erosion is happening…


Ages of RiversA. Young Rivers

Fast-flowing, V-shaped valleys, waterfalls, and rapids

B. Mature RiversLess energy, slower, meanders (1), sandbars

C. Old RiversVery slow, shallow, large amounts of sediment deposited, many narrow channels, islands, deltas (2)

A

B

C

(2)

(1)

Quick Action: INB


Decide which picture matches the description of each river age. Drag the label over it.

Young River

Mature River

Old River

Young River

Mature River

Old River

A.

B.

C.



Features Created by Wind• Caused by abrasion from wind-blown sand

• Arches• Sand dunes• Mushroom Rocks

How are these features formed?

These features are formed when…




A. Landslides (fast)B. Mud flows

C. Slump/creep (slow)

Gravity Causes the Earth to ChangeGravity shapes the Earth’s surface by moving weathered material from a higher place to a lower one.


Features Created by Glaciation• Caused as massive glaciers flow downhill bulldozing existing rocks• U-Shaped Valley• Hanging Valley• Horn• Moraine• Cirque• Tarn lake• Arête


Weathering, Erosion, and Deposition Features Created by water (waves)• Erosional and depositional features which form along coastlines

• The western U.S. coastline has more erosional features.

• The eastern U.S. coast and the Gulf of Mexico has more depositional features.

Quick Action: INB


Which agents of erosion can you find in these images? Drag and drop the labels below on the remaining pictures.

WATER

WIND

WATER

GRAVITY

WIND

ICE

WATER

GRAVITY


Think About It


The Louisiana coastlines are eroding due to severe hurricane destruction and human impact such as dredging canals. Now hurricanes have a more severe affect on the area. Louisiana now has very little land to buffer it from storms like Hurricane Katrina that devastated the state in 2005. Design a possible solution to help rebuild the land that has been lost.

Chandeleur Islands off of the Louisiana coastTo rebuild the land that was lost, Louisiana could…



Weathering, Erosion, and DepositionEcoregions of the United States• Areas defined by its environmental conditions, especially climate, landforms, and soil characteristics.

What is an ecoregion?

An ecoregion is an area defined by its…



Weathering, Erosion, and DepositionEcoregions Environmental

Conditions

Soil characteristics

• Amount of vegetation

• Dry (arid) – very little vegetation (poor soil)

• Humid – large amount of vegetation (good soil)

Climate – weather conditions in an area over time

• Tropical

• Arid

• Mediterranean

Landforms – crustal material

• Mountains – high elevation

• Plateaus – medium to high elevation

• Plains – low elevation


Weathering, Erosion, and DepositionExamples of Ecoregions• Subtropical (Florida, South

Eastern States)

• Tundra (N Alaska)

• Temperate Steppe (Great Plains)

• Marine Mountains (Coastal Washington and Oregon)

• Desert and Desert Mountain (Nevada and parts of New Mexico)



Weathering, Erosion, and DepositionWhat determines how the processes of weathering, erosion, and deposition work to reshape Earth’s surface?

• Rivers• Rock formations• Soils• Topography• Precipitation


Quick Action: INB


Look at the two maps of Texas below. Make a list of the similarities and differences you can find in the box to the left.

Elevation Soil/ Topography

The map on the right shows elevation, and the map on the left shows soil types. I notice that the soil types seem to change when the…


Quick Action: INB


Look at two more maps of Texas below. Make a list of the similarities and differences you can find in the box to the left.

PrecipitationRivers

The map on the left shows precipitation like rain or snow, and the map on the right shows rivers. I notice that areas that get more rain also have…


Quick Action: INB


Look at the map of the ecoregions of Texas on the right. In the box to the left, describe how it appears to be affected by the rivers, soils, topography, and precipitation you saw in the previous maps.

It seems like the ecoregions are affected by the…


Last Look Weathering, Erosion, and DepositionTypes of Chemical

WeatheringTypes of

Mechanical Weathering Agents of Erosion Factors Shaping Earth’s Surface

Click on and drag each card to its correct location.

RiversAbrasion Water

TopographyTemperature

Oxidation

Rock Formations

Soils

Precipitation

Hydrolysis

Ice Wedging

Plant Roots

Gravity Carbonation

BurrowingWind Ice

Gravity


Give your best answer to...

1. What effects does weathering have on the environment in ecoregions?

2. What effects does erosion have on the environment in ecoregions?

3. What effects does deposition have on the environment in ecoregions?

Check for Understanding

Weather affects the environment by…

Erosion affects the environment by…

Deposition affects the environment by…


Still have questions?

Which essential questions do you still need help to understand?

Type your answer here


Deposition Erosion and Weathering,

Documents

Transcript of Deposition Erosion and Weathering,