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Science Do Now: 12-8

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Science Do Now: 12-8 EQ: What are plates and how do they move? LG: Describe the three types of tectonic plate boundaries, the forces that move them, and how movement ... – PowerPoint PPT presentation

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Title: Science Do Now: 12-8


1
ScienceDo Now 12-8
EQ What are plates and how do they move?
  • LG Describe the three types of tectonic plate
    boundaries, the forces that move them, and how
    movement is measured.
  • HW 7-3 worksheet due Wed,
  • Test on Thursday study session at 815
  • List 3 types of convergent boundaries use
    arrows to show movement
  • Take out color pencils/markers
  • Take out Plate Tectonic notes
  • Today
  • Complete PPT Theory of Plate Tectonics
  • Convection Current Organizer

2
List 3 types of convergent plate boundaries
use arrows to show movement
What is here?

  • Oceanic-Oceanic
  • Oceanic-Continental
  • Continental-Continental

What is here?
3
The Theory of Plate Tectonics
4
Think of a Broken EGG! ?
Plate Boundary
Plate
5
Plate Tectonics
  • The Earths lithosphere is divided into plates
    that move on top of the asthenosphere.

Earths Major Plates
When the water moves beneath the raft, the raft
moves with it. When the asthenosphere moves, the
lithosphere moves with it
6
Here is a look at a different map!
Where are most plate boundaries located? What
plate do we live on?
7
And another
8
Types of Plate Boundaries
  • When two plates meet, they form a boundary.
  • There are three types of boundaries

9
Convergent Boundaries
  • Two plates push together
  • Term to know SUBDUCTION means the crust is
    SINKING!
  • Three types of convergent boundaries
  • 1. Ocean/Ocean TRENCH
  • 2. Ocean/Continental TRENCH
  • 3. Continental/Continental MOUNTAINS

10
Convergent Collision 1 (Oceanic/Oceanic)
  • One of the plates will SINK (subduction!) and
    form a TRENCH. Magma rises and forms and island
    arc of volcanoes.

Subduction Zone
11
Convergent Collision 2 (Oceanic/Continental)
  • The oceanic plate sinks (subduction!) below the
    continent and the continental plate slides over
    the top of the oceanic plate. Forms a TRENCH.

Subduction Zone
12
Convergent Collision 3(Continental/Continental)
  • Both continental plates collide and rise up
    forming MOUNTAINS. (Ex. Himilayas)

13
Divergent Boundaries
  • Two plates pull apart forming a rift valley in
    the middle.
  • Sea-floor spreading is created by a divergent
    boundary.

Rift Valley
Click Here to see Divergent Boundaries in
motion!!!
14
When the divergent boundary is on land . There
is a HUGE rift valley in east Africa called the
Great Rift Valley
15
Transform Boundaries
  • Plates slide past each other in a side to side
    motion. (Ex. San Andreas Fault)

This fence used to line up!! Before the 1906
Earthquake in California
San Andreas Fault
16
WHY do the plates move?
  • CONVECTION CURRENTS in the mantleHot rock
    (less dense) rises to the surface, cools (more
    dense), and sinks back to the mantle.

COOL MOLTEN ROCK SINKS
HOT MOLTENROCK RISES
17
Convection Currents
18
Less
Rise
More
Sink
Same Volume
More matter
Less matter
Same Volume
More matter
Less matter
Less
Rise
More
Sink
19
Convection Currents
Cools off! more dense fall to the bottom
Hot! less dense rise to the top
See Animation
http//education.sdsc.edu/optiputer/flash/convecti
on.htm
20
REVIEW BOUNDARIES!
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