Seafloor Spreading Pdf

Lithospheric plate with oceanic crust is dragged down at trenches.

Seafloor spreading pdf.

The center slit represents a mid ocean ridge 2. These cornerstones are convectional current theory and paleomagnetism. 60 cm long paper strip 1 compass 1 box of markers 1 cardboard box lid 1 bar magnet meter stick or ruler 3. Formally proposed by dietz 1961 and hess 1962.

The theory has caused a revolution in the way we think about the earth. Sea floor spreading entire lesson pdf version sea floor spreading whole lesson w comments do now introduction. Examine sea floor spreading. A model of seafloor spreading key 1.

Mantle upwells under mid ocean ridge mor. Lithosphere with new oceanic crust is formed at mor then spreads laterally as if on conveyor belt. 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. This process occurs along divergent plate boundaries at areas called mid ocean ridges.

Seafloor spreading and other tectonic activity processes are the result of mantle convection. Arthur holmes in 1930s discussed the possibility of convection currents. The older rock is close to 400 million years. Mantle convection is the slow churning motion of earth s mantle.

The earth does not get bigger. The best known ridge on the globe runs straight down the. Make predictions about future events related to this data. Convection currents carry heat from the lower mantle and core to the lithosphere.

Plot data on a diagram. 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. Have students work in groups of four. Seafloor spreading is the creation of new seafloor or new oceanic crust 5.

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. Students still enter the same way they quietly get to their seats and take. Since the development of the theory geologists have had to reexamine almost every. Draw conclusions from the data.

Convection current theory convection current theory is the soul of seafloor spreading theory. 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. Have students pick up materials needed for the activity. The oldest sections should be the sections on both sides furthest from the middle 4.

Learning objectives students will be able to. 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. They will also model sea floor spreading at a spreading center such as the mid atlantic ridge.