Table of Contents
- 1 Which theory of plate movement relies on the weight of subducting crust?
- 2 Which theory of plate movement involves magma rising all the way from the lower mantle?
- 3 What was an argument used to dispute the theory of plate tectonics?
- 4 What boundary can create a subduction zone?
- 5 What is a divergent boundary?
- 6 What are the 3 theories of plate tectonics?
- 7 How are divergent boundaries formed along strike slip faults?
- 8 Where is crust pushed down into the mantle?
- 9 Where is crust destroyed at a transform boundary?
Which theory of plate movement relies on the weight of subducting crust?
Slab pull is that part of the motion of a tectonic plate caused by its subduction. In 1975 Forsyth and Uyeda used the inverse theory method to show that, of the many forces likely to be driving plate motion, slab pull was the strongest.
Which theory of plate movement involves magma rising all the way from the lower mantle?
Convection currents carry heat from the lower mantle and core to the lithosphere. Convection currents also “recycle” lithospheric materials back to the mantle. Seafloor spreading occurs at divergent plate boundaries.
What was an argument used to dispute the theory of plate tectonics?
Answer: Option D, Continents cannot cut through the ocean floor. Explanation: It was believed earlier that oceans were the land bridges that used to connect different geologic plates of planet earth earlier, had now sank down and thus there exists no connection between the tectonic plates.
Which was an idea used to promote the theory of plate tectonics?
The main idea that Wegener and others had was that modern continents formed a single landmass in the past. This idea was supported by simple observations like the fact that South-American and African coastlines fit so well, or that we can find the same fossils in similar sedimentary rocks on both continents.
Which layer of the Earth is the only true liquid layer?
The outer core is the liquid largely iron layer of the earth that lies below the mantle. Geologists have confirmed that the outer core is liquid due to seismic surveys of Earth’s interior.
What boundary can create a subduction zone?
convergent plate boundaries
Subduction zones are where the cold oceanic lithosphere sinks back into the mantle and is recycled. They are found at convergent plate boundaries, where the oceanic lithosphere of one plate converges with the less dense lithosphere of another plate.
What is a divergent boundary?
A divergent boundary occurs when two tectonic plates move away from each other. Along these boundaries, earthquakes are common and magma (molten rock) rises from the Earth’s mantle to the surface, solidifying to create new oceanic crust. The Mid-Atlantic Ridge is an example of divergent plate boundaries.
What are the 3 theories of plate tectonics?
The three types of plate boundaries are divergent, convergent, and transform. They are described in the following three concepts. Most geological activity takes place at plate boundaries.
What is best explained by plate tectonics?
The theory of plate tectonics states that the Earth’s solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet.
Which is the best example of a convergent plate boundary?
Answer: The Washington-Oregon coastline of the United States is an example of this type of convergent plate boundary. Here the Juan de Fuca oceanic plate is subducting beneath the westward-moving North American continental plate. The Cascade Mountain Range is a line of volcanoes above the melting oceanic plate.
How are divergent boundaries formed along strike slip faults?
Transform: Along strike-slip faults. Divergent boundaries are formed when plates are pulling apart, such as at ocean ridges; this kind of force is called tension. The opposite boundary is a convergent boundary, where two plates collide in compression; this happens near subduction zones.
Where is crust pushed down into the mantle?
Subduction is where crust is pushed down into the mantle, destroying it, not forming it. C. near transform boundaries. That’s not it. Crust is neither created nor destroyed at transform boundaries. D. at normal faults.
Where is crust destroyed at a transform boundary?
Crust is neither created nor destroyed at transform boundaries. D. at normal faults. That’s not it. Normal faults generally form at divergent boundaries, where crust is formed. The correct answer is: where crust is destroyed.
How are divergent boundary and convergent boundary formed?
Divergent boundaries are formed when plates are pulling apart, creating new crust. The opposite boundary is a convergent boundary; this happens near subduction zones, where crust is destroyed. In a transform boundary, two plates grind past each other, neither creating nor destroying crust.