Module 6 Lesson 1: Mass Movements

Module 6: Mass Movements, Wind and Glaciers

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Mass Movements

• Mass Movement is the downslope movement of soil and rock resulting from the force of gravity.

• Mass Movements are directly effected by weather conditions and climate.

• They can range from small rock falls to massive amounts of material drastically changing landscapes.

Read the Chapter and Finish Your Notes Before Working on the Questions That Follow.

https://www.youtube.com/watch?v=mknStAMia0Q

You can also follow this link to a short video with some more information on mass movements (and some sweet footage).

Multiple Choice

What is the one factor that causes mass movements above all else.

• Earthquakes

• Gravity

• Wind

• Fire

Multiple Select

Check all below that are factors the book mentions influence mass movements

• Material Weight

• Material Resistance to Sliding

• A Trigger

• Water

Multiple Choice

A slow, steady downward movement is called

• Rush

• Pour

• Creep

• Crawl

Study this slide carefully, the next question will ask you about it!!

Multiple Choice

How would you classify this Mass Movement? (now that you're an expert and all)

• Creep

• Avalanche

• Rock fall

• Mudslide

Multiple Choice

Unlike mudslides, Landslides typically move as:

• A bunch on tiny pieces

• Almost like a thick liquid

• One big piece

• Uphill

Multiple Select

How many avalanches happen in the mountains of the Western US? (quick go grab your book and turn to page 141!!)

• 16

• 14,00,000

• 10,000

• 7,851

Human Impact

• Mass movements are natural, but human activity can impact their size and frequency.

• Construction of buildings, roads and bridges can make slops unstable.

• Looks expensive --->

Reducing the Risk

• We can reduce the risk by not building in areas prone to mass movements, or at the bottom of unstable slopes.

• More importantly, we can stop REBUILDING in areas that have already been destroyed.

• We can also building trenches, retaining walls, fences and metal nets to catch debris.

Multiple Choice

However, according to the textbook these prevention methods are:

• Permanent and work perfectly

• Temporary Solutions

Poll

If you could choose any age to stay for the rest of your life, what would it be?

• 14

• 19

• 30

• 41