Sea Floor Spreading And Subduction Zones Worksheet Answers

Continue pulling the magma strips until the magma sticks slide across the ocean floor.

Sea floor spreading and subduction zones worksheet answers.

Then answer the questions below. The old crust gets pushed to the. While new earth is being born at mid ocean ridges by seafloor spreading in other areas earth is being destroyed at deep ocean trenches by subduction. Seafloor spreading is happening at b.

Subduction happens where tectonic plates crash into each other instead of spreading apart. At deep ocean trenches subduction allows part of the ocean floor to sink back into the mantle over tens of millions of years. A deep ocean trench forms where the oceanic crust bends downward. Where there are deep ocean trenches subduction takes place.

Review answers to the seafloor structure handout by filling in the diagrams on board or using smartboard. Seafloor spreading explore 1 subduction in trenches 1. Directions the diagram on the reverse side depicts an area of the ocean floor where different plates are shifting due to plate tectonics. Subduction is the process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle.

As the ocean seafloor spreads the newly formed floor will adapt a specific magnetic signature according to the earth s magnetic pole at that time. The answer is that the ocean floor generally does not just keep spreading. As years pass lateral segments of seafloor will thus share the same signature on either side of the mid oceanic ridge. Explain that seafloor spreading and movement is a cyclical process because it is constantly being created and destroyed.

As magma flows out of the ridge the newly formed crust pushes older crust away from the ridge. The two processes of seafloor spreading and subduction work together to constantly recycle and renew the earth s crust. Refer back to the demonstration that you performed during the engage portion of the lesson to demonstrate this. This creates new ocean crust.

Begin by labeling the parts draw an arrow to indicate which feature you mean. The denser lithospheric material then melts back into the earth s mantle. Instead the ocean floor plunges into deep under water canyons called deep ocean trenches. Students should change the model so that magma is pushed out of the ridge not pulled.

Seafloor spreading is just one part of plate tectonics. By printing out this quiz and taking it with pen and paper creates for a good variation to only playing it online. You may use your book and whatever notes you have. At subduction zones the edge of the denser plate subducts or slides beneath the less dense one.