Which property of the rock found on the ocean floor supports the theory of sea floor spreading?
Iron-bearing minerals, such as magnetite, that are found in the rocks of the seafloor can record Earth’s magnetic field direction when they form. This discovery provided strong support that seafloor spreading was indeed occurring.
What supports the theory of seafloor spreading?
Abundant evidence supports the major contentions of the seafloor-spreading theory. First, samples of the deep ocean floor show that basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached, and the sediment cover is thinner near the ridge.
How are features on the seafloor related to the concept of seafloor spreading?
Seafloor spreading produces major characteristics of the seafloor – 1) the age of the seafloor is progressively older away from midocean ridges, 2) the elevation of the seafloor is progressively lower away from midocean ridges, 3) the magnetic history of the seafloor bears the striped-pattern of the Earth’s magnetic …
How does the observed change in seafloor age support the theory of sea floor spreading?
The ages of rocks helps to prove the theory of the sea floor spreading by hot less dense liquids below earth’s crust rising toward the surface of the mid ocean ridges. Magma would then flow up and cool into seafloor. As it would then move away from the mid ocean ridge and become cooler and denser.
What are the lines of evidence that support the plate movement?
Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed. Some life “rode” on diverging plates, became isolated, and evolved into new species.
What would happen if tectonic plates move faster?
Big tremors are more likely in mountain ranges where plates grind together at high speed. When plates smash into each other at higher speeds, more of the crust at the collision sites becomes brittle, and that makes the region more prone to large quakes. …
How do you measure tectonic plate movement?
Geodesy, the science of measuring the Earth’s shape and positions on it, allows the measurement of plate motion directly using GPS, the Global Positioning System. This network of satellites is more stable than the Earth’s surface, so when a whole continent moves somewhere at a few centimeters per year, GPS can tell.
What do we call the amount of force placed on something?
what is the amount of force placed on a given material called? stress. the process by which the shape of a rock changes because of stress. deformation. when stress squeezes an object it is called.
What is a divergent tectonic plate?
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. Two plates sliding past each other forms a transform plate boundary.