Plate

Boundaries

and Plate

Interactions

Goals

• Classify and label the types of movement at plate boundaries, using a world map that shows relative plate motions

• Identify the distribution of plates by means of the world map of relative plate motions

• Describe the present plate-tectonic setting of your community, and infer possible past plate-tectonic activity based on your knowledge.

• Divergent Plate Boundary• Convergent Plate Boundary • Transform Plate Boundary

Think About It• Write a caption for this cartoon. • The most interesting ride on a plate would

be the leading or trailing plate.

Investigate page 79

• Answer Part C and Part D• Read Digging Deeper pg. 80-85• Answer questions #1-7 on page 85 in

your comp book. • No you don’t have write the questions in

your comp book, but only if you write a complete answer.

• Add the Geo words into your illustrated glossary.

Divergent Plate Boundary

• It’s a plate boundary where two plates move away from one another

• Example: South American & African Plate

Divergent Plate Boundary

• Young divergence has thin or thinning crust and rift valleys

• Example: Mid Ocean Ridge and East Pacific Rise

Divergent Boundaries

Convergent Plate Boundary

• A plate boundary where two plates go toward each other• The denser crust will always subduct beneath the other

crust. Sometimes these make ocean trenches.• Nazca plate & South American Plate

Convergent Plate Boundary

• If denser oceanic crust subbducts beneath continental crust, a volcanic chain – Ex) Andes or the

Cascades

Convergent Plates

• The sinking material can partially melt. This makes volcanic island arcs.– Ex) Aleutian

islands and Japan

Convergent Plate BoundaryWhen 2 continents collide that are both to light to subduct the crust is crumpled and uplifted to make great mountain chains – ex) Himalayas and Appalachian

Transform Plate Boundary• When two plates move parallel from each

other• San Andreas Fault• AKA: parallel slip

San Andreas Fault• SAF is the boundary

between the North American and Pacific plates.

• The fault runs from the Gulf of Calif. NW to Mendocino County in N. California

Transform Plate Boundaries

Transform Plate Boundaries

Homework

• Visit the following website and record examples of each type of plate boundary into your comp book.

• http://geology.com/plate-tectonics.shtml

• Study for your quiz on Tuesday

• Tectonic Setting for Volcanic Activity animations

Warm-Up

1. Write a brief definition for each of the following terms and give an example of where you might find each:

a) Divergent Plate Boundary

b) Convergent Plate Boundary

c) Transform Plate Boundary

Warm-Up

1. Convergent boundaries can be in three different settings. What are they?

2. Name the 3 types of boundaries between lithospheric plates

3. What happens when two continent plates collide along a convergent plate boundary?