Sea Floor Spreading And Subduction Zones Worksheet Answers

Refer back to the demonstration that you performed during the engage portion of the lesson to demonstrate this.

Sea floor spreading and subduction zones worksheet answers.

Continue pulling the magma strips until the magma sticks slide across the ocean floor. At deep ocean trenches subduction allows part of the ocean floor to sink back into the mantle over tens of millions of years. At subduction zones the edge of the denser plate subducts or slides beneath the less dense one. Explain that seafloor spreading and movement is a cyclical process because it is constantly being created and destroyed.

The answer is that the ocean floor generally does not just keep spreading. This is a free printable worksheet in pdf format and holds a printable version of the quiz seafloor spreading and subduction. Then answer the questions below. Directions the diagram on the reverse side depicts an area of the ocean floor where different plates are shifting due to plate tectonics.

Subduction happens where tectonic plates crash into each other instead of spreading apart. Subduction is the process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle. This creates new ocean crust. The denser lithospheric material then melts back into the earth s mantle.

Seafloor spreading explore 1 subduction in trenches 1. Instead the ocean floor plunges into deep under water canyons called deep ocean trenches. Review answers to the seafloor structure handout by filling in the diagrams on board or using smartboard. As years pass lateral segments of seafloor will thus share the same signature on either side of the mid oceanic ridge.

Seafloor spreading is just one part of plate tectonics. 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. Where there are deep ocean trenches subduction takes place. Molten rock pushes up from the asthenosphere and pushes the plates apart at the mid ocean ridge.

Students should change the model so that magma is pushed out of the ridge not pulled. The old crust gets pushed to the. As magma flows out of the ridge the newly formed crust pushes older crust away from the ridge. 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.

Seafloor spreading is happening at b. Begin by labeling the parts draw an arrow to indicate which feature you mean. You may use your book and whatever notes you have. The two processes of seafloor spreading and subduction work together to constantly recycle and renew the earth s crust.