How is seafloor spreading plate tectonics evidence?
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.
What are three pieces of evidence for seafloor spreading?
The pieces of evidence gathered for sea-floor spreading include the evidence from molten material, magnetic stripes, and drilling samples.
What theory did the evidence of sea-floor spreading confirm?
Hess’ theory of seafloor spreading states that hot magma from Earth’s mantle rises up through the mid-oceanic ridges. This magma cools and flows sideways, forming new seafloor. Hot magma continues to rise from the mid-oceanic ridge, constantly producing new oceanic crust.
Who provide the evidence of seafloor spreading?
In the 1960s, geologist Harry Hess proposed that the sea floor was moving outward from the midoceanic ridges. 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.
What are the strongest evidence for the seafloor spreading?
When the Earth’s magnetic field reverses, a new stripe, with the new polarity, begins. Such magnetic patterns led to recognition of the occurrence of sea-floor spreading, and they remain some of the strongest evidence for the theory of plate tectonics.
What is the 5 evidence of seafloor 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.
Who proved that the seafloor is spreading?
Harry Hess
Harry Hess: One of the Discoverers of Seafloor Spreading.
What is the best piece of evidence for plate tectonics?
There is variety of evidence that supports the claims that plate tectonics accounts for (1) the distribution of fossils on different continents, (2) the occurrence of earthquakes, and (3) continental and ocean floor features including mountains, volcanoes, faults, and trenches.
What are the evidences of tectonic plates?
What are the four different evidences of plate movements?
Evidence for Plate Tectonics
- Shape of continents. From almost the creation of the first true maps of the Earth, people started seeing how continents would be able to fit together.
- Location of mountains and fossils.
- Earthquakes and Volcanoes.
- Hot Spot Volcanoes.
What type of evidence for the plate tectonic theory is provided when scientist discovered that the magnetic field reverses polarity?
This further provided evidence for plate tectonics. More evidence came when scientist examined the sea floor and saw that there were reversals of polarity of Earth’s magnetic field that was in a striped pattern. The strips of polarity reversal were mirror images on each side of the mid- ocean ridge.
What are the evidences of plate tectonic theory?
Which of the following evidence support the plate tectonic theory?
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.