Download Lesson Outline for Teaching

Lesson Outline for Teaching
Lesson 3: Mass Wasting and Glaciers
A. Mass Wasting
1. Mass wasting is the downhill movement of a large mass of rocks or soil because of
the pull of gravity.
2. Mass wasting usually occurs on the side of a hill when the soil is soaked with
rainwater.
3. Thick vegetation on slopes can help prevent mass wasting.
4. A(n) landslide is the rapid downhill movement of soil, loose rocks, and boulders.
a. In landslides, such as mudslides and rockfalls, soil moves in a large mass.
b. Erosion is most destructive when a landslide occurs on a(n) steep slope.
5. Erosion due to mass wasting continues as long as the force of gravity is greater than
other forces holding rock and soil in place.
a. The material from a(n) landslide eventually comes to rest, usually in a flat place.
b. Talus is a pile of angular rocks and sediment from a rockfall.
6. Building on a steep slope can increase the chances that mass wasting will occur.
Removing vegetation from a slope and using heavy machinery promote mass
wasting.
B. Glacial Erosion and Deposition
1. A(n) glacier is a large mass of ice that formed on land and moves slowly across
Earth's surface.
a. Glaciers form where the amount of snowfall is greater than the amount of snow
melt.
b. Alpine glaciers form in mountains.
c. Ice sheets cover large areas of land and move outward from central locations.
d. During the last ice age Florida's coastline was deeper than today.
2. Glaciers cause erosion as they move, with rocks frozen in the ice, carving grooves in
underlying surfaces of Earth. Glacial erosion can cause sharp ridges called aretes
and carve out U-shaped and hanging valleys.
3. Glaciers deposit material when they melt, either when they flow downhill to
warmer places or when the climate gets warmer.
a. Till is a mixture of various sizes of sediment deposited by a glacier.
b. A mound or ridge of unsorted sediment deposited by a glacier is a(n) moraine.
c. Outwash is layered sediment deposited by streams of water that flow from a
melting glacier. It is mainly well sorted sand and gravel.
4. Global Warming is the gradual increase in Earth's average temperature.
a. Human activities contribute to global warming.
b. Because of global warming, glaciers have been melting, which leads to a(n) rise in
sea level.