Erosion and Deposition Chapter 3Section 1

Standard

S 6.2 Topography is reshaped by the weathering of roc and soil and by the transportation and deposition of sediment.

Anticipatory SetGravity affecting materialsSmall board on desk, roll marble down, observe what

happensSmall board on desk, roll block down, observe what

happensPut sandpaper on board, roll marble down, observe

what happensPut sandpaper on board, roll block down observe what

happensHow were they different?

VocabularyErosion- process of natural forces such as

water, wind, ice or gravity that weathers a rock and moves it from one place to another.

Sediment- small, solid particles from weathered rocks

Deposition-laying down sediment in new placesGravity- a force that moves weathered rocks

downhillMass movement- any one of the several

processes that moves rocks downhill

Input

Mudslide is a good example of erosion It carries soil and gravel downhill after a rainGravity, water, glaciers, waves and winds all

cause erosion. The material that is moved by erosion is

called sediment.Sediment: rock, soil, plants and animal

remains

Input

Deposition- where the agents of erosion deposit or lay down sediment.

It changes the land formThis cycle has been occurring for thousands

of yearsWeathering, erosion, and deposition act

together to wear down and build up Earth’s surface.

Mass Movement Input

If you were on the top of a hill, sitting on a bike, what is the name of the term that pushes you down the hill without pedaling?

Gravity Gravity causes mass movement Different types of mass movement

Landslides Mudflows Slum Creep

Input

Landslide- occurs when rock and soil slide rapidly down a steep slope.

They occur where road builders have cut highways through highways and mountains.

Mudflows- a rapid downhill movement of a mixtures of water, soil, and rock. The amount of water in a mudflow is higher than a landslide.

An earthquake can trigger mudflows and landslides

Landslide/Mudflow

Input

Slump- a mass of rock and soil rapidly slips down a slope.

It moves down in 1 large massOccurs when water soaks the bottom of soil that

is rich in clayCreep- very SLOW downhill movement of rock

and soil. Result from freezing and thawing of water in cracks under the soil.

Creep may tilt objects at spooky angles.

Creep

Checking for Understanding

What is sediment?What are the four types of mass movement?What is mass movement caused by?What is the difference between a slump and a

landslide?

Guided PracticeIndependent Practice

Page 55# 1-4Check with teacher for answers

IP-Note Taking Guide Pg 56-57 # 1-21