What is most likely to happen in nearby areas when edges of crustal plates collide or rub against each other?
As the plates rub against each other, huge stresses can cause portions of the rock to break, resulting in earthquakes. Places where these breaks occur are called faults.
What are the advantages and disadvantages of diverging plate boundaries?
Advantage: They provide land to stand on, so we can be land mammals rather than ocean creatures. Disadvantage: The move around sometimes, causing earthquakes that knock down our buildings and kill people.
What is the advantage of divergent plate boundaries?
Divergent boundaries also form volcanic islands, which occur when the plates move apart to produce gaps that magma rises to fill. Current research indicates that complex convection within the Earth’s mantle allows material to rise to the base of the lithosphere beneath each divergent plate boundary.
What are the characteristics of oceanic plate?
Oceanic plates are mafic in nature, composed of basalt rock and its coarse-grained equivalent, gabbro, both rich in iron, magnesium and calcium. In contrast, continental plates are felsic in nature, dominated by granitic rock with its abundant silica, aluminum, sodium and potassium.
What are 2 oceanic plates?
An example of an oceanic plate is the Pacific Plate, which extends from the East Pacific Rise to the deep-sea trenches bordering the western part of the Pacific basin. A continental plate is exemplified by the North American Plate, which includes North America as well as the oceanic crust…
How many oceanic plates are there?
seven major plates
What is the largest oceanic plate?
Are oceanic plates more dense?
Oceanic plates under the ocean are made of basalt rock and are more dense than continental plates under land masses. We learned that when an oceanic plate collides with a continental plate, the oceanic plate creates a subduction zone, diving under the continental plate.
Why is oceanic crust so dense and heavy?
Oceanic crust is denser because it generally melts to a higher fraction than continental crust. Generally lighter minerals melt before denser ones. When rocks melt to 20–30% like they do at mid-ocean ridges, the result is more dense than when rocks melt to form continental plates, which is typically 1–5%.
What happens to the part of the oceanic crust as it reaches the asthenosphere?
Answer: When the less dense, lighter continental plate overrides the oceanic plate a subduction zone forms. This material moves into the mantle above the plate and causes the mantle to melt. This liquid rock, called magma, rises to the surface because it is less dense then the surrounding rock.
When two oceanic plate boundaries meet what crustal feature forms?
When two oceanic plates converge, both a trench and a string of volcanoes are formed. These volcanoes can build to produce island chains, such as the Mariana Islands, which are located alongside the Marianas Trench.
Which of the following is an example of a convergent oceanic oceanic plate boundary?
Examples of ocean-ocean convergent zones are subduction of the Pacific Plate south of Alaska (creating the Aleutian Islands) and under the Philippine Plate, where it creates the Marianas Trench, the deepest part of the ocean.
What are the five plate boundaries?
Tectonic Plates and Plate Boundaries
- Convergent boundaries: where two plates are colliding. Subduction zones occur when one or both of the tectonic plates are composed of oceanic crust.
- Divergent boundaries – where two plates are moving apart.
- Transform boundaries – where plates slide passed each other.
What are the geological features of Transform plate boundaries?
The grinding action between the plates at a transform plate boundary results in shallow earthquakes, large lateral displacement of rock, and a broad zone of crustal deformation. Perhaps nowhere on Earth is such a landscape more dramatically displayed than along the San Andreas Fault in western California.
What are examples of transform plate boundaries?
The most famous example of this is the San Andreas Fault Zone of western North America. The San Andreas connects a divergent boundary in the Gulf of California with the Cascadia subduction zone. Another example of a transform boundary on land is the Alpine Fault of New Zealand.
Do fracture zones near transform boundaries play a role in plate motion?
Do fracture zones near transform boundaries play a role in plate motion? No, fracture zones play no role in plate motion. Transform boundaries connect segments of mid-ocean ridges.
How are transform plate boundaries formed?
Two plates sliding past each other forms a transform plate boundary. Natural or human-made structures that cross a transform boundary are offset—split into pieces and carried in opposite directions. Rocks that line the boundary are pulverized as the plates grind along, creating a linear fault valley or undersea canyon.