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What is the longest area of sea floor spreading in the world?

The total length of the oceanic ridge system is 80,000 km (49,700 mi) long.

What is the approximate rate of seafloor spreading?

These age data also allow the rate of seafloor spreading to be determined, and they show that rates vary from about 0.1 cm (0.04 inch) per year to 17 cm (6.7 inches) per year.

Where is seafloor spreading today?

Where is active sea floor spreading occurring today? Seafloor spreading is the movement of old rock that is being pushed by the new young oceanic crust. This would be a divergent since the plates are separating from each other. Active seafloor spreading is occurring at mid-ocean ridges.

What does seafloor spreading look like?

The continual process of seafloor spreading separated the stripes in an orderly pattern. Oceanic crust slowly moves away from mid-ocean ridges and sites of seafloor spreading. As it moves, it becomes cooler, more dense, and more thick.

What evidence is used to support seafloor spreading?

The study of the repeated reversal of the Earth’s magnetic poles over time has provided convincing evidence of seafloor spreading. Objective: To explore how magnetic studies and age information provide evidence for seafloor spreading that explains why oceanic crust is younger than continental crust.

What are 3 pieces of evidence to support that seafloor spreading is happening?

Look at Figure 19 to see the process of sea-floor 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.

What is the strongest evidence 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.

What is seafloor spreading theory?

Seafloor spreading, theory that oceanic crust forms along submarine mountain zones, known collectively as the mid-ocean ridge system, and spreads out laterally away from them. Rising magma assumes the polarity of Earth’s geomagnetic field before it solidifies into oceanic crust.

Which boundaries is seafloor destroyed?

You are correct that the seafloor is destroyed at subduction zones, but it is simultaneously being created at mid-ocean ridges. see figure 1 . Figure 1: Seafloor spreading at a mid-ocean ridge(where new crust is being created) and it’s destruction at a subduction zone.

Is seafloor destroyed?

Basaltic magma forming at mid-ocean ridges serves as a kind of “tape recorder”, recording the Earth’s magnetic field as it reverses through time. The oldest known ocean floor is dated at about 200 million years, indicating that older ocean floor has been destroyed through subduction at deep-sea trenches.

What causes seafloor spreading?

Seafloor spreading creates new oceanic crust at a mid-ocean ridge. When this new material reaches the end of the plate and comes into contact with another plate, whether continental or not, a convergent or a transform boundary will occur.

Which way do transform boundaries move?

Transform boundaries — where crust is neither produced nor destroyed as the plates slide horizontally past each other.

What does a transform boundary look like?

Earth Floor: Plate Tectonics. Places where plates slide past each other are called transform boundaries. In other places, transform boundaries are marked by features like stream beds that have been split in half and the two halves have moved in opposite directions.

What happens when two plates slowly crash into each other?

Part of Hall of Planet Earth. When oceanic or continental plates slide past each other in opposite directions, or move in the same direction but at different speeds, a transform fault boundary is formed. No new crust is created or subducted, and no volcanoes form, but earthquakes occur along the fault.

Why will one plate go under the other instead of just crashing into each other?

Since continental crust is more bouyant, or less dense, than oceanic crust, one plate does not easily override the other. Instead, the plates crumple as they plow into one another, and a very high mountain range is created.

What will happen when two oceanic plates move towards each other?

When two plates move towards each other, the boundary is known as a convergent boundary. When two oceanic plates converge, the denser plate will end up sinking below the less dense plate, leading to the formation of an oceanic subduction zone.

What happens when two crust collide?

At convergent boundaries, where plates push together, crust is either folded or destroyed. When two plates with continental crust collide, they will crumple and fold the rock between them. A plate with older, denser oceanic crust will sink beneath another plate. The crust melts in the asthenosphere and is destroyed.

What happens when two plates rub against each other as they move in opposite directions?

Plates Slide Past One Another Plates grinding past each other in opposite directions create faults called transform faults. Powerful earthquakes often strike along these boundaries.

What happens to the cookies as they push against each other?

With the cookie halves pushed against each other, slide them sideways, against each other. This is called a _______________________________ plate boundary.