What are the 5 steps of sea floor 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.
How does the seafloor spread Explain your answer briefly?
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.
What are 3 types of evidence for seafloor spreading?
Several types of evidence from the oceans supported Hess’s theory of sea-floor spreading-evidence from molten material, magnetic stripes, and drilling samples. This evidence also led sci- entists to look again at Wegener’s theory of continental drift.
What do the stripes represent in seafloor spreading model?
The strips of paper represent oceanic crust or seafloor. 3. The oldest sections should be the sections on both sides furthest from the middle 4. Seafloor spreading is the creation of new seafloor or new oceanic crust 5.
What is the process of sea spreading?
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 are the 4 evidences 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.
What is seafloor spreading quizlet?
sea-floor spreading. the process by which molten material adds new oceanic crust to the ocean floor.
What is the first step of seafloor spreading?
Which is the first step in the seafloor spreading process? A crack forms in oceanic crust.
What are the 4 evidences for seafloor spreading?
What are the features of seafloor?
Features of the ocean floor include the continental shelf and slope, abyssal plain, trenches, seamounts, and the mid-ocean ridge. The ocean floor is rich in resources. Living things on the ocean floor are used for food or medicines. Nonliving resources include oil, gas, and minerals.
What do the stripes on the strips stand for why is it important that your model have an identical pattern of stripes on both sides of the center slit?
Why is it important that your model have an identical pattern of stripes on both sides of the center slit? The stripes on the strips stand for the magnetic stripes located on the ocean floor, which indicates the reversal of the Earth’s poles.
What does each band of color on the seafloor represent?
Colored maps show bands of different colors across the ocean floor and each different colored band represents the span of time in which the rocks within that band formed. The seafloor becomes progressively older on both sides of the mid-ocean ridges.
How is sea floor formed?
As plates converge, one plate may move under the other causing earthquakes, forming volcanoes, or creating deep ocean trenches. Where plates diverge from each other, molten magma flows upward between the plates, forming mid-ocean ridges, underwater volcanoes, hydrothermal vents, and new ocean floor crust.
What are the main features of the seafloor spreading model?
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 …
What is seafloor spreading hypothesis?
sea-floor spreading — a hypothesis, proposed in the early 1960s, that new ocean floor is created where two plates move away from one another at mid-ocean ridges.
What is the first step of sea floor spreading?
1. A long crack in the oceanic crust forms at a mid ocean ridge. 2. Molten material rises and erupts along the ridge.
Which is the first step in the seafloor spreading process quizlet?
What are the steps in the process of sea floor spreading?
What are the steps in the process of sea floor spreading? 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 are facts about seafloor spreading?
• Seafloor spreading is the movement of two oceanic plates away from each other (at a divergent plate boundary), which results in the formation of new oceanic crust (from magma that comes from within the Earth’s mantle) along a mid- ocean ridge. Where the oceanic plates are moving away from each other is called a zone of divergence.
What is the process of sea floor spreading?
Magma comes out of the rift valley.
What is an example of sea floor spreading?
Seafloor Spreading is the usual process at work at divergent plate boundaries, leading to the creation of new ocean floor. As two tectonic plates slowly separate, molten material rises up from within the mantle to fill the opening. In this way the rugged volcanic landscape of a mid-ocean ridge is created along the plate boundary.