Transcript Deforming the Earth`s Crust

Science
Do Now: 1-6
EQ: How can the Earth’s crust change?
LG: Identify the three types of stress movement, the faults
they create and the resulting deformation.
HW: Project, Read 8-1 and complete ws
7- 4 Brain 
** List the 3 types of stresses and use arrows
to show movement**
1. Take out your vocab homework and stack for
collection
Today:
~ Complete Deformation of the Earth’s Crust ppt
w/notes
Deforming the Earth’s
Crust
Types of Stress
Deformation: When the shape of a rock
changes due to stress
1. Compression = squeezing or pushing together
(convergent boundaries)
2. Tension = forces stretch an object
(divergent boundaries)
3. Shearing = slicing motion back and forth
(transform boundaries)
Types of Folding
•
Folding: rock layers bending because of
stress
1. Anticline = upward bend
Think “Ant hill”
2. Syncline = downward bend
Think “Sink”
3. Monocline = bend with horizontal ends
Mono = 1
cline = slope
Types of Faulting
• Fault: a break in the Earth’s crust where
movement takes place
• Hanging wall: the layers of rock ABOVE the
fault line (…above the diagonal)
• Footwall: the layers of rock BELOW the fault
line (…below the diagonal)
FOOTWALL
HANGING
WALL
Hanging Wall and Footwall
How can I remember which is which???
Identify the Hanging Wall
Hanging Wall
Hanging Wall
Hanging Wall
Hanging Wall
Why care about the hanging
wall????????????
To identify the type
fault!!!!
You MUST…
1. Find the hanging wall
2. See which way it is moving
Types of Faults
1. Reverse Fault = the hanging
wall slides up the foot wall
2. Normal Fault = the hanging
wall slides down the foot wall
3. Strike slip Fault = the rocks
on either side of the fault line
slide past each other
Quiz Add On
Identify each picture as a syncline or an
anticline
5.
6
Folded Mountains
• COMPRESSION…
mountains formed at
continental/continental convergent
boundaries.
Appalachian Mtns.
• Ex. Appalachian Mountains
Fault Block Mountains
• TENSION… causes large blocks of the
Earth’s crust to drop down compared to
the rocks around it.
• Ex. Tetons (in Wyoming)
Volcanic Mountains
• Formed at Ocean/Continental and
Ocean/Ocean Convergent boundaries.
• Ex. Ring of Fire
Ring of Fire
Mount Saint Helens
You’ve seen this before!...
K
NORMAL
FAULT
L
ANTICLINE
SYNCLINE