Admin What is evidence of seafloor?
Abundant evidence supports the major contentions of the seafloor-spreading theory. Magnetic surveys conducted near the mid-ocean ridge showed elongated patterns of normal and reversed polarity of the ocean floor in bands paralleling the rift and symmetrically distributed as mirror images on either side of it.
What are three examples of evidence from the sea floor that prove Earth’s tectonic plates move?
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.
What are the 2 evidence of seafloor spreading?
Evidence of Sea Floor Spreading. Harry Hess’s hypothesis about seafloor spreading had collected several pieces of evidence to support the theory. This evidence was from the investigations of the molten material, seafloor drilling, radiometric age dating and fossil ages, and the magnetic stripes.
How does the seafloor spread?
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. Eventually, the crust cracks.
Which is evidence from the sea floor shows that tectonic plates move?
Which evidence from the sea floor shows that tectonic plates move? ridge and farther away. C) mid ocean ridges form the longest range of mountains on earth. D) the sea floor is thinner than the crust. Yes, A is correct. A!!! Duh!! I has to be A. I got A and it was CORRECT!!!!!!!!!! XD WHAT A HEADACHE, THIS TOOK ME ALMOST 2 HOURS!
How is the sea floor evidence for subduction?
1 spreading center. Subduction. Subduction zones are often marked by overlying chains 2 Magnetic anomalies. Magnetic surveys over the ocean floor in the 1960s revealed symmetrical patterns 3 Seismic studies. More proof for sea floor spreading comes from seismic studies indicating 4 Modern plate tectonic theory.
How are continental drift and sea floor spreading related?
By the 1960s, the theories of continental drift and sea floor spreading were supported by reliable scientific data and combined to develop modern‐day plate tectonic theory. The theory maintains that the crust and uppermost mantle, or lithosphere, is segmented into a number of solid, rigid slabs called lithospheric plates.
How does the new crust form on the sea floor?
His theory of sea floor spreading maintained that new basaltic oceanic crust forms at a midoceanic ridge and is slowly pushed away on both sides toward the continents as more new crust is produced. (Measurements indicate that new crust moves away from a ridge at rates from 2 to 10 cm/year.)