Divergent boundaries
Convergent boundaries
Transform boundaries
2. What does the word divergent mean in regard to plate movement? What forces the plates to move apart at divergent boundaries?
Divergent means that plates are moving apart and what force the plate to move apart because magma pushing up from the mantle, which then moves the plate.
3. Give an example of a specific mid-ocean ridge where seafloor spreading and divergent boundaries occur. What country sits directly on top of this ridge? What are the red triangles that are shown on the map of this country?
Mid-Atlantic Ridge divergent moving rate of spreading is a averages about 2.5 centimeters per year or 25 km in a million years. The southern tip of Africa sit directly on top of this ridge. Red triangles show inactive underwater volcano.
4. What does the word convergent mean in regard to plate movement?
Plates moving toward each other and have a collision and where on plate the
denser plate goes up and less denser plate go toward the mantle.
5. Find the diagrams shown on the website for each of the following kinds of plate boundaries. Label and post the three diagrams on your blog.
Oceanic-continental convergence
Oceanic-oceanic convergence
Continental-continental convergence
Oceanic-oceanic convergence
Continental-continental convergence
6. When one plate gets pushed below another plate it is called subduction. What geologic features form on Earth’s surface directly above the subduction zone in the case of:
a. oceanic-continental convergence?
A number of long narrow, curving trenches form and are thousands of kilometers long. These trenches are 8 to 10 km deep cutting into the ocean floor.
b. oceanic-oceanic convergence?
When two oceanic plates converge, one plate is usually subducted under the other plate, and in the process which trenches formed. This can also result in the formation of underwater volcanoes.
c. continental-continental convergence?
When two continental plate converge they make a mountain ridge like the Himalayas when the Indian and Eurasian plates had a collision.
7. What is a transform boundary? What geological disturbance is caused along transform boundaries? Where in North America is there an example of this type of plate boundary?
A transform boundary is the zone between two plates sliding horizontally past one another. The geological disturbence caused be the transform boundaries is that Canadian geophysicist J. Tuzo Wilson, concept that transform faults were that large faults or fracture zones connect two spreading centers. The San Andreas fault zone in California is an example of these plates in North America.
8. Using the Internet and a focused search, identify the type of plate interaction that caused the following features:
a. Mid-Atlantic Ridge
divergent plate boundary plates/ Oceanic-Oceanic Plates
b. Kuril Trench
Convergent boundaries plates/ Oceanic-Oceanic Plates
c. Phillipine Islands
Convergent boundaries plates/ Oceanic-Oceanic Plates
d. East African Rift Valley
Divergent boundaries plates/Continental-Continental Plates
e. Red Sea
Divergent boundaries plates/Continental-Continental Plates
f. Peru-Chile Trench
Convergent boundaries plates/Oceanic-Oceanic Plates
g. Aleutian Islands
Convergent boundary plates/ Oceanic-Oceanic Plates
