Seafloor Spreading Pdf

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.

Seafloor spreading pdf.

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. Lithospheric plate with oceanic crust is dragged down at trenches. Seafloor spreading and other tectonic activity processes are the result of mantle convection. These cornerstones are convectional current theory and paleomagnetism.

Examine sea floor spreading. 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. This process occurs along divergent plate boundaries at areas called mid ocean ridges.

Learning objectives students will be able to. The earth does not get bigger. Seafloor spreading is the creation of new seafloor or new oceanic crust 5. Sea floor spreading entire lesson pdf version sea floor spreading whole lesson w comments do now introduction.

Students still enter the same way they quietly get to their seats and take. 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. The oldest sections should be the sections on both sides furthest from the middle 4. The best known ridge on the globe runs straight down the.

The center slit represents a mid ocean ridge 2. Formally proposed by dietz 1961 and hess 1962. Convection current theory convection current theory is the soul of seafloor spreading theory. Make predictions about future events related to this data.

National science education standards. Mantle convection is the slow churning motion of earth s mantle. Arthur holmes in 1930s discussed the possibility of convection currents. Convection currents also recycle lithospheric materials back to the mantle.

The theory has caused a revolution in the way we think about the earth. The strips of paper represent oceanic crust or seafloor. The older rock is close to 400 million years. They will also model sea floor spreading at a spreading center such as the mid atlantic ridge.

Lithosphere with new oceanic crust is formed at mor then spreads laterally as if on conveyor belt. Students will make their own models of seafloor spreading and the magnetic strips that occur in the seafloor. A model of seafloor spreading key 1. Since the development of the theory geologists have had to reexamine almost every.

Convection currents carry heat from the lower mantle and core to the lithosphere. Mantle upwells under mid ocean ridge mor. Plot data on a diagram. To understand the concept of seafloor spreading we must first understand some basic concepts that form the cornerstones for the concept of seafloor spreading.