Post on 13-Jan-2016
Today’s Agenda…
Flashback Notes on Erosion – Part II BrainPop on Erosion Chapter 11 Review Worksheet (Due
Tuesday)
Erosion – Part II
Study Pack # 11
Today’s Goals…
I can explain the causes of erosion. I can describe the effects of erosion.
Review…
What is erosion? How is it different than weathering? How do weathering and erosion work
together? What are the four causes of erosion?
More Review…
How does gravity cause erosion? What is it called when gravity alone causes
rocks or sediment to move down hill? What are the four different types of mass
movement? How are the four types of mass movement
different?
Ice
Glaciers are large pieces of ice Glaciers move downhill because of gravity
– They pick up sediments and carry them
Ice
Glaciers remove the lose pieces of rock from weathered rocks
Glaciers carrying these rocks can scratch and erode rocks as they move
Ice
What are the effects?– Glaciers can remove rock from mountain tops– Produce wider, u-shaped valleys– Figure 12, page 327– Glaciers lay down sediments and then they are
washed away
Wind
How would wind cause erosion? When wind blows loose sediment, it carries
it away Wind that is carrying sediments can also
wear down other rocks, this is called abrasion
Wind
When wind slows down it will drop sediment – this is called depositon
This could create certain landforms– Sand dunes
Water
How does water cause erosion? When water flows over Earth’s surface it is
called runoff Runoff can carry sediments The faster the water is running, the more
sediment it can carry
Water
Water can flow over Earth’s surface in many ways
Read pages 329 – 330– Sheet Flows– Rills and Gullies– Streams
THINK
PAIR SHARE
Erosion Changes Earth’s Surface
Rock and sediments are moved from one place to another
Where material is removed canyons and valleys form
Where material is deposited deltas, sandbars, and sand dunes are created