Seafloor Spreading Pdf

The best known ridge on the globe runs straight down the.

Seafloor spreading pdf.

Seafloor spreading is the creation of new seafloor or new oceanic crust 5. The oldest sections should be the sections on both sides furthest from the middle 4. Examine sea floor spreading. 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. Sea floor spreading entire lesson pdf version sea floor spreading whole lesson w comments do now introduction. Convection currents also recycle lithospheric materials back to the mantle. Students still enter the same way they quietly get to their seats and take.

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. Arthur holmes in 1930s discussed the possibility of convection currents. Plot data on a diagram.

Since the development of the theory geologists have had to reexamine almost every. 60 cm long paper strip 1 compass 1 box of markers 1 cardboard box lid 1 bar magnet meter stick or ruler 3. Have students pick up materials needed for the activity. To understand the concept of seafloor spreading we must first understand some basic concepts that form the cornerstones for the concept of seafloor spreading.

Formally proposed by dietz 1961 and hess 1962. The older rock is close to 400 million years. Lithosphere with new oceanic crust is formed at mor then spreads laterally as if on conveyor belt. The theory has caused a revolution in the way we think about the earth.

This process occurs along divergent plate boundaries at areas called mid ocean ridges. Sea floor spreading earth science post module 2 middle school page 3 the youngest rock will always be closest to the ridge area and the oldest will be on the outside closest to the continents. Mantle convection is the slow churning motion of earth s mantle. Mantle upwells under mid ocean ridge mor.

Convection currents carry heat from the lower mantle and core to the lithosphere. Have students work in groups of four. Lithospheric plate with oceanic crust is dragged down at trenches. Make predictions about future events related to this data.

These cornerstones are convectional current theory and paleomagnetism. Convection current theory convection current theory is the soul of seafloor spreading theory. Students will make their own models of seafloor spreading and the magnetic strips that occur in the seafloor. The earth does not get bigger.

National science education standards. Draw conclusions from the data. The center slit represents a mid ocean ridge 2. Seafloor spreading and other tectonic activity processes are the result of mantle convection.