What is the cause of seafloor spreading?
Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor.
Which boundary is seafloor destroyed?
At convergent plate boundaries, oceanic crust is often forced down into the mantle where it begins to melt. Magma rises into and through the other plate, solidifying into granite, the rock that makes up the continents. Thus, at convergent boundaries, continental crust is created and oceanic crust is destroyed.
What are the 4 types of plate boundary?
Plate Boundaries and Hotspot Demonstration
- Divergent Plate Boundary. Volcanic eruptions and shallow earthquakes are common where plates rip apart.
- Convergent Plate Boundary.
- Transform Plate Boundary.
- Hotspot.
What is an example of a divergent boundary?
The mid-Atlantic ridge is an example of a divergent boundary, where the Eurasian Plate that covers all of Europe separates from the North American Plate. This underwater mountain range is constantly growing as new crust is formed. Further up that same boundary, it passes through Iceland.
What are the three types of convergent boundary?
Three types of convergent boundaries are recognized: continent‐continent, ocean‐continent, and ocean‐ocean.
- Continent‐continent convergence results when two continents collide.
- Ocean‐continent convergence occurs when oceanic crust is subducted under continental crust.
Which is the best example of a convergent plate boundary?
Examples of ocean-continent convergent boundaries are subduction of the Nazca Plate under South America (which has created the Andes Mountains and the Peru Trench) and subduction of the Juan de Fuca Plate under North America (creating the Cascade Range).
What landforms are created by convergent boundaries?
Deep ocean trenches, volcanoes, island arcs, submarine mountain ranges, and fault lines are examples of features that can form along plate tectonic boundaries. Volcanoes are one kind of feature that forms along convergent plate boundaries, where two tectonic plates collide and one moves beneath the other.
Which of the following is the best example of divergent boundaries?
Perhaps the best known of the divergent boundaries is the Mid-Atlantic Ridge. This submerged mountain range, which extends from the Arctic Ocean to beyond the southern tip of Africa, is but one segment of the global mid-ocean ridge system that encircles the Earth.
What are the example of transform boundary?
Transform boundaries are where two of these plates are sliding alongside each other. This causes intense earthquakes, the formation of thin linear valleys, and split river beds. The most famous example of a transform boundary is the San Andreas Fault in California.
What is the best example of transform fault boundary?
San Andreas Fault
Which of the following best describes a transform boundary?
Transform boundaries are places where plates slide sideways past each other. At transform boundaries lithosphere is neither created nor destroyed. Many transform boundaries are found on the sea floor, where they connect segments of diverging mid-ocean ridges. California’s San Andreas fault is a transform boundary.
What would be found at a divergent boundary?
Effects that are found at a divergent boundary between oceanic plates include: a submarine mountain range such as the Mid-Atlantic Ridge; volcanic activity in the form of fissure eruptions; shallow earthquake activity; creation of new seafloor and a widening ocean basin.
Where is the oldest rock found at a divergent boundary?
Period 3- Open Notes Test Review
| Question | Answer |
|---|---|
| At a divergent boundary, where is the oldest rock found? | far away from the mid-ocean ridge |
| What type of boundary creates new sea floor? | divergent |
| At a divergent boundary, which direction do the plates move? | away from each other |
What type of rock is found at a transform boundary?
The sedimentary and metamorphic rocks across the fault line are similar to those found in Redwood National and State Parks on the North Coast of California. They were lifted out of the ocean as part of the accretionary wedge of an ancient subduction zone.
What happens at a transform boundary?