Seafloor Spreading Pdf

Convection currents also recycle lithospheric materials back to the mantle.

Seafloor spreading pdf. Students still enter the same way they quietly get to their seats and take. Lithospheric plate with oceanic crust is dragged down at trenches. Convection current theory convection current theory is the soul of seafloor spreading theory. 60 cm long paper strip 1 compass 1 box of markers 1 cardboard box lid 1 bar magnet meter stick or ruler 3.

Mantle convection is the slow churning motion of earth s mantle. A model of seafloor spreading key 1. Make predictions about future events related to this data. 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. Plot data on a diagram. Have students pick up materials needed for the activity. Examine sea floor spreading.

Sea floor spreading entire lesson pdf version sea floor spreading whole lesson w comments do now introduction. 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. To understand the concept of seafloor spreading we must first understand some basic concepts that form the cornerstones for the concept of seafloor spreading. National science education standards.

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 older rock is close to 400 million years. Mantle upwells under mid ocean ridge mor. Since the development of the theory geologists have had to reexamine almost every.

Seafloor spreading is the creation of new seafloor or new oceanic crust 5. Seafloor spreading and other tectonic activity processes are the result of mantle convection. Lithosphere with new oceanic crust is formed at mor then spreads laterally as if on conveyor belt. Learning objectives students will be able to.

The theory has caused a revolution in the way we think about the earth. Have students work in groups of four. Students will make their own models of seafloor spreading and the magnetic strips that occur in the seafloor. Draw conclusions from the data.

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. Convection currents carry heat from the lower mantle and core to the lithosphere. The strips of paper represent oceanic crust or seafloor.

The best known ridge on the globe runs straight down the. The earth does not get bigger. These cornerstones are convectional current theory and paleomagnetism. Arthur holmes in 1930s discussed the possibility of convection currents.