- What happens when two plates collide?
- What is the seafloor made of?
- What are 3 types of evidence for seafloor spreading?
- Where is seafloor created?
- Who discovered seafloor spreading?
- At which type of boundary is is seafloor destroyed?
- How is seafloor destroyed?
- What are the 2 types of plates?
- What is the most dangerous tectonic plate?
- What causes seafloor spreading?
- What are the steps in the process of seafloor spreading?
- What is seafloor spreading theory?
- Which type of boundaries can produce earthquakes?
- Why are most earthquakes shallow?
- How is seafloor created?
What happens when two plates collide?
If two tectonic plates collide, they form a convergent plate boundary.
Usually, one of the converging plates will move beneath the other, a process known as subduction.
The new magma (molten rock) rises and may erupt violently to form volcanoes, often building arcs of islands along the convergent boundary..
What is the seafloor made of?
It is composed of the upper oceanic crust, with pillow lavas and a dike complex, and the lower oceanic crust, composed of troctolite, gabbro and ultramafic cumulates. The crust overlies the solidified and uppermost layer of the mantle. The crust and the solid mantle layer together constitute oceanic lithosphere.
What are 3 types of evidence for seafloor spreading?
Several types of evidence supported Hess’s theory of sea-floor spreading: eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves. This evidence led scientists to look again at Wegener’s hypothesis of continental drift.
Where is seafloor created?
Oceanic plates are continuously forged at mid-ocean ridges, an undersea mountain chain created where the edges of two plates are separating.
Who discovered seafloor spreading?
Harry HessHarry Hess: One of the Discoverers of Seafloor Spreading main content.
At which type of boundary is is seafloor destroyed?
Seafloor spreading is when the sea floor spreads apart. This occurs at Divergent Boundaries. At which type of boundary is seafloor destroyed? The seafloor is destroyed at a COnvergent Boundary.
How is seafloor destroyed?
Framework Integration: Themes: Patterns of change: over time, new sea-floor is created by the upwelling of magma at mid-ocean spreading centers; old ocean floor is destroyed by subduction at deep sea trenches.
What are the 2 types of plates?
The two types of tectonic plates are continental and oceanic tectonic plates.
What is the most dangerous tectonic plate?
Since earthquakes also trigger tsunamis, it is fair to say they give floods fierce competition for the world’s deadliest natural disasters. The San Andreas Fault, where the Pacific Plate slips alongside the North American Plate, runs through California and is one of the most famous plate boundaries.
What causes seafloor spreading?
Sea-floor spreading is what happens at the mid-oceanic ridge where a divergent boundary is causing two plates to move away from one another resulting in spreading of the sea floor. As the plates move apart, new material wells up and cools onto the edge of the plates.
What are the steps in the process of seafloor spreading?
What are the steps in the process of sea floor spreading?Magma comes out of the rift valley.Magma cools to rock and hardens.Rock is pushed away as new rock is formed at MOR.Oceanic crust and continental crust meet at the trench.Oceanic crust bends down under the continental crust.Gravity pulls rock towards mantle.Rock melts to mantle.
What is seafloor spreading theory?
Seafloor spreading, theory that oceanic crust forms along submarine mountain zones, known collectively as the mid-ocean ridge system, and spreads out laterally away from them. …
Which type of boundaries can produce earthquakes?
Most earthquakes occur at the boundaries where the plates meet. In fact, the locations of earthquakes and the kinds of ruptures they produce help scientists define the plate boundaries. There are three types of plate boundaries: spreading zones, transform faults, and subduction zones.
Why are most earthquakes shallow?
Quakes can strike near the surface or deep within the Earth. Most quakes occur at shallow depths, according to the U.S. Geological Survey. … Shallow quakes generally tend to be more damaging than deeper quakes. Seismic waves from deep quakes have to travel farther to the surface, losing energy along the way.
How is seafloor created?
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.