Weathering and Erosion Weathering and Erosion

Student Objectives Student Objectives

Analyze effects of regional deposition and Analyze effects of regional deposition and weathering weathering

Definitions Definitions

Weathering- mechanical or chemical surfaces Weathering- mechanical or chemical surfaces processes that break rocks into smaller pieces processes that break rocks into smaller pieces

Types of Weathering Types of Weathering

MechanicalMechanical Breaks materials down Breaks materials down Same properties as the Same properties as the

original material just original material just changes in sizechanges in size

Example: Example: Gravel becoming smaller Gravel becoming smaller

Chemical Chemical Breaks materials down Breaks materials down Change of properties, Change of properties,

material becomes a material becomes a totally new substance totally new substance

Example: Example: Iron rusting Iron rusting

What type of weathering is this: What type of weathering is this: mechanical or chemical? mechanical or chemical?

Can you tell what animal lies atop Can you tell what animal lies atop this stone? this stone?

Definitions Definitions

Slope- land that slants down or up Slope- land that slants down or up

Definition Definition Erosion- process in which surface materials Erosion- process in which surface materials

are worn away and transported from one place are worn away and transported from one place to another by agents such as gravity, water, to another by agents such as gravity, water, wind, and glaciers wind, and glaciers

Definitions Definitions

Deposition- dropping of sediments that occur Deposition- dropping of sediments that occur when an agent of erosion such as gravity, when an agent of erosion such as gravity, wind, or water loses its energy and can no wind, or water loses its energy and can no longer carry its load longer carry its load

Erosion and WeatheringErosion and Weathering

Video Narration/ Video Narration/

Question and Answering Question and Answering

Student Objectives Student Objectives

Define the differences between Define the differences between weatheringweathering and and erosionerosion

List the agents of erosionList the agents of erosion Define Define physical weatheringphysical weathering, , chemical chemical

weatheringweathering, and , and erosionerosion Describe how Describe how windwind, , waterwater, , ice,ice, and and gravity gravity

affect the surface of earthaffect the surface of earth

The forces of nature not only build up the land The forces of nature not only build up the land but also wear it down. These major processes but also wear it down. These major processes are _________ ____________, are _________ ____________, __________weathering, and __________. __________weathering, and __________.

_______, _______, ______ and even _______ _______, _______, ______ and even _______ and ___________ all play their part in turning and ___________ all play their part in turning the mightiest mountains into the tiniest grains the mightiest mountains into the tiniest grains of sand. of sand.

physical weatheringphysical weatheringchemicalchemical erosion erosion

Water wind iceWater wind ice plantsplantsanimalsanimals

________ ___________ is the actual ________ ___________ is the actual breaking breaking downdown of rock by the action of natural forces, of rock by the action of natural forces, such as water, wind, ice, plants and animals.such as water, wind, ice, plants and animals.

The most common cause of physical weathering The most common cause of physical weathering is due to constant ________ and _______ of is due to constant ________ and _______ of water in and around rocks. water in and around rocks.

Physical weatheringPhysical weathering

freezing meltingfreezing melting

How does freezing water affect rocks?How does freezing water affect rocks?

________ ___________ causes changes in the ________ ___________ causes changes in the rocks from the rocks from the reaction of different chemicalsreaction of different chemicals on the surface of the rocks.on the surface of the rocks.

The most common example of chemical The most common example of chemical weathering is called ____________. _______is weathering is called ____________. _______is an example of oxidation. an example of oxidation.

________ changes into oxidized iron (rust). ________ changes into oxidized iron (rust).

Fe + O Fe O Fe + O Fe O

Chemical weatheringChemical weathering

oxidation Rustoxidation Rust

IronIron

3 2 2 33 2 2 3 Iron + Oxygen RustIron + Oxygen Rust

________, a plant that covers rocks, is an ________, a plant that covers rocks, is an example of chemical weathering. This plant example of chemical weathering. This plant secretes a mild acid, _____________, that eats secretes a mild acid, _____________, that eats away or dissolves the surface of rocks.away or dissolves the surface of rocks.

LichenLichen

Carbonic acidCarbonic acid

________ is the process of ___________, ________ is the process of ___________, __________, or ____________ away __________, or ____________ away weathered rock material.weathered rock material.

Water, wind, ice, and gravity all serve in eroding- Water, wind, ice, and gravity all serve in eroding- ____________ weathered material greater ____________ weathered material greater distances, but _________ is the most significant distances, but _________ is the most significant force of erosion.force of erosion.

ErosionErosion washingwashingblowing carryingblowing carrying

transportingtransportingwaterwater

What are 3 ways water erosion can happen?What are 3 ways water erosion can happen?

________________________________________________________________________________________________________ Lifting rocks, grinding rocks, dissolving rocks Lifting rocks, grinding rocks, dissolving rocks

Examples of Erosion Examples of Erosion

Rocky Mountains Grand Canyon Rocky Mountains Grand Canyon

__________, huge sheets or mountains of __________, huge sheets or mountains of ice that melt after a ice age or during ice that melt after a ice age or during global warming leave behind ice-carved global warming leave behind ice-carved valleys. valleys.

Yosemite Valley Yosemite Valley

GlaciersGlaciers

____________ causes tiny grains of sand to ____________ causes tiny grains of sand to be carried causing polishing and be carried causing polishing and reshaping.reshaping.

Sand dunes Sand dunes

Wind erosion Wind erosion

Video Quiz Video Quiz

Video Quiz Video Quiz

Soil: Broken (disintegrated) rock, humus, plants and animals

Video Quiz Video Quiz

Mass wasting