Landscapes Day 4

Climate and Mass Movement

Do Now 1. The diagram shows the stump of a tree

whose root grew into a small crack in bedrock and split the rock apart.

The action of the root splitting the bedrock is an example of what type of weathering?

 

Do Now (Cont.) 2. Which agent of erosion was primarily

responsible for forming the long, narrow, U-shaped valleys in the Finger Lakes region of New York State?

3. If you had two rock samples, one limestone and the other granite, which rock type would weather faster and why?

Aim, Learning Target & Agenda

AIM: What is the effect of climate on weathering

landscapes? How can large amounts of land be eroded at the

same time? Learning Target:

I can describe how landscapes are altered by climate and mass movement.

Agenda: Do Now Lesson on Weathering (continued) Project Assignment

Climate How does climate differ from the weather?

Climate is the characteristic weather of a region over an extended period of time.

Climate influences the TYPE of weathering and the RATE (speed) of

weathering.

Climate Arid (dry) regions do not experience much

weathering. Hot & humid (wet) regions experience more

chemical weathering Cold & humid (wet) regions experience more

physical weathering

What causes valleys like this?

Glaciers Create U-shaped valleys Glaciers have rocks stuck in the ice along the

sides and bottom of the glacier. Depending on how hard the rocks are, they

can scratch the bedrock that the glacier is passing over

These scratches are called striations

Glaciers Glaciers also drop random large boulders

places.

Mass Movements DUE TO GRAVITY! Usually weathering happens slowly and

gradually. Sometimes, it can happen rapidly in the form

of mass movements Ex: rockfalls and mudslides Or, it can happen slowly overtime: soil creep,

slump

Rock falls

Mud Flows (aka mudslides)

Soil Creep

Landslides http://video.nationalgeographic.com/video/env

ironment/environment-natural-disasters/landslides-and-more/landslides/