Table of Contents
- 1 What causes seafloor spreading quizlet?
- 2 Who is responsible for sea seafloor spreading?
- 3 How did Harry Hess prove seafloor spreading?
- 4 What causes the seafloor to spread and continents to drift?
- 5 What causes the seafloor to spread apart at Mid-ocean ranges?
- 6 What causes the sea floor to spread apart at Mid-ocean ranges?
- 7 What is the primary force that causes the seafloor to spread?
- 8 What are facts about seafloor spreading?
- 9 What evidence supports the theory of seafloor spreading?
What causes seafloor spreading quizlet?
Terms in this set (10) Mid-ocean ridges are part of a large, volcanic mountain range that winds through Earth’s oceans; deep ocean trenches are deep canyons in the ocean floor beneath which oceanic lithosphere sinks into the mantle through subduction. Explain what occurs during sea-floor spreading.
Who is responsible for sea seafloor spreading?
Harry H. Hess
The seafloor spreading hypothesis was proposed by the American geophysicist Harry H. Hess in 1960.
How did Harry Hess prove seafloor spreading?
Hess discovered that the oceans were shallower in the middle and identified the presence of Mid Ocean Ridges, raised above the surrounding generally flat sea floor (abyssal plain) by as much as 1.5 km. This created new seafloor which then spread away from the ridge in both directions.
What causes the seafloor to spread apart at mid ocean ridges quizlet?
What causes the sea floor to spread apart at mid-ocean ranges? Hot magma rises through the boundaries at the mid-ocean ranges, creating new rock as it cools and pushing the plates apart.
What is the order of seafloor spreading?
What are the steps of seafloor spreading in order from first to last? Answer: a crack forms, magma pushes upward, rock moves outward, magma hardens.
What causes the seafloor to spread and continents to drift?
Plate tectonics
| Question | Answer |
|---|---|
| The primary force that causes the seafloor to spread and continents to drift | Thermal convection |
| Plate | Tectonics |
| The zone below the list of fear is more plastic then the lithosphere so it is easier to bend | Asthenosphere |
| Zones place where the seafloor is forced under continental plates | Subduction |
What causes the seafloor to spread apart at Mid-ocean ranges?
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 causes the sea floor to spread apart at Mid-ocean ranges?
Seafloor spreading is the process by which new oceanic lithosphere forms at mid-ocean ridges. As tectonic plates move away from each other, magma rises from Earth’s interior. It then cools and solidifies in the center of the ridge. The rising magma pushes up between the plates and drives them further apart.
What are the 5 steps for seafloor spreading?
Terms in this set (7)
- 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 the primary force that causes sea floor spreading?
The primary force that motivates seafloor to spread is convection of heat from the mantle causing upwelling through the crust.
What is the primary force that causes the seafloor to spread?
The primary force which causes the seafloor to spread and continents to drift is tectonic movement of our tectonic plates. This happens all the time but we don’t observe it and don’t necessarily see it. It becomes very observable when there is a huge earthquake for example. 5.0.
What are facts about seafloor spreading?
What Happens During the Process of Seafloor Spreading? History. Scientists originally believed that drifting was an occurrence exclusive to continents through continental drifts. Geographic Features. The process of seafloor spreading leads to the formation of numerous geographical features which can be terrestrial, sub-terrestrial, or marine features. Mid-Ocean Ridges.
What evidence 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.