Seafloor Spreading Pdf

National science education standards.

Seafloor spreading pdf.

These cornerstones are convectional current theory and paleomagnetism. Given that this lesson is a continuation from the previous day there is no traditional do now as there is in most of my other lessons. Mantle upwells under mid ocean ridge mor. Mantle convection is the slow churning motion of earth s mantle.

Students still enter the same way they quietly get to their seats and take. Convection currents also recycle lithospheric materials back to the mantle. The best known ridge on the globe runs straight down the. Seafloor spreading and other tectonic activity processes are the result of mantle convection.

Seafloor spreading is the creation of new seafloor or new oceanic crust 5. A model of seafloor spreading key 1. Formally proposed by dietz 1961 and hess 1962. Learning objectives students will be able to.

Lithosphere with new oceanic crust is formed at mor then spreads laterally as if on conveyor belt. The earth does not get bigger. Convection currents carry heat from the lower mantle and core to the lithosphere. Lithospheric plate with oceanic crust is dragged down at trenches.

The older rock is close to 400 million years. To understand the concept of seafloor spreading we must first understand some basic concepts that form the cornerstones for the concept of seafloor spreading. Arthur holmes in 1930s discussed the possibility of convection currents. Have students work in groups of four.

The center slit represents a mid ocean ridge 2. The theory has caused a revolution in the way we think about the earth. The oldest sections should be the sections on both sides furthest from the middle 4. This process occurs along divergent plate boundaries at areas called mid ocean ridges.

They will also model sea floor spreading at a spreading center such as the mid atlantic ridge. Continental drift sea floor spreading and plate tectonics plate tectonics is a theory developed in the late 1960s to explain how the outer layers of the earth move and deform. Students will make their own models of seafloor spreading and the magnetic strips that occur in the seafloor. Seafloor spreading is the process of molten material from the mantle being pushed upward to the surface of the earth and spreading apart creating new earth.

The strips of paper represent oceanic crust or seafloor. Plot data on a diagram. Draw conclusions from the data. Examine sea floor spreading.

Since the development of the theory geologists have had to reexamine almost every. Have students pick up materials needed for the activity. Convection current theory convection current theory is the soul of seafloor spreading theory. Make predictions about future events related to this data.