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Transcript
Seafloor Spreading Investigation 1 State Science Standards MA 6MS-ESS2-3 Analyze and interpret maps showing the distribution of fossils and rocks, continental shapes and seafloor structures to provide evidence that Earth’s plates have moved great distances, collided, and spread apart. Focus Question How can seafloor structures provide evidence that Earth is constantly in motion? Prediction ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ Inquiry Observe the map on page 24. Write down 5 observations about the map, the information on it and its key. 1. ___________________________________________________ ___________________________________________________ 2. ___________________________________________________ ___________________________________________________ 3. ___________________________________________________ ___________________________________________________ 4. ___________________________________________________ ___________________________________________________ 5. ___________________________________________________ ___________________________________________________ Build Background Knowledge Fill in the two column notes below. Mid Ocean Ridges Page 24 1. Mid Ocean Ridges ___wind___ beneath Earth’s oceans. 2. Most of the ____mountains____ in the _MidOcean Ridge__ system lie hidden under hundreds of meters of ____water________. 3. Where does the mid ocean ridge rise above the surface of the water? In the North Atlantic Ocean (Iceland) Sea-floor Spreading Page 25 1. What scientist believed Wegner after studying maps of mid ocean ridges? Harry Hess 2. Sea-floor Spreading sea continually adds new material to the ocean floor 3. Sea-floor spreading begins at the Mid Ocean Ridge. Subduction at the Trenches Page 28 1. Ocean floor plunges into deep underwater __canyons______ called ________deep ocean trenches________. 2. In a process taking __tens of millions of years________________ part of the ocean floor sinks back into the ___mantle____ at ____deep ocean trenches_________. 3. Define subduction: _____________________________________________ process by which ocean floor sinks beneath a deepocean trench and back into the mantle. Diagram and Model Apply 4. Sea-floor spreading and subduction work together. They move the ___ocean floor_____ as if it were on a giant conveyer belt. 1. On the following page turn your paper sideways and draw 2. Create a human model of seafloor spreading Number the steps below from 1-5 to show the sequential order of seafloor spreading. Start with number one for what would happen first. Number 2 has been done for you. ___3____ Old ocean floor meets continental crust at the deep ocean trench ___1____ Magma erupts from the mid ocean ridge and cools to form new ocean floor ___2___ Oceanic crust gets pushed towards the trench and away from the Mid Ocean Ridge ____4___ Oceanic crust gets subducted into the deep ocean trench ____5___ Old ocean crust gets “recycled” as it turns back into molten material in the asthenosphere