Seafloor Spreading Pdf

The theory has caused a revolution in the way we think about the earth.

Seafloor spreading pdf.

Convection currents also recycle lithospheric materials back to the mantle. Examine sea floor spreading. These cornerstones are convectional current theory and paleomagnetism. This process occurs along divergent plate boundaries at areas called mid ocean ridges.

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. To understand the concept of seafloor spreading we must first understand some basic concepts that form the cornerstones for the concept of seafloor spreading. Mantle convection is the slow churning motion of earth s mantle. Draw conclusions from the data.

Formally proposed by dietz 1961 and hess 1962. The earth does not get bigger. 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.

Plot data on a diagram. The strips of paper represent oceanic crust or seafloor. Have students work in groups of four. Make predictions about future events related to this data.

Lithosphere with new oceanic crust is formed at mor then spreads laterally as if on conveyor belt. The best known ridge on the globe runs straight down the. Convection current theory convection current theory is the soul of seafloor spreading theory. The oldest sections should be the sections on both sides furthest from the middle 4.

A model of seafloor spreading key 1. 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. 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.

Convection currents carry heat from the lower mantle and core to the lithosphere. Students still enter the same way they quietly get to their seats and take. The center slit represents a mid ocean ridge 2. Sea floor spreading entire lesson pdf version sea floor spreading whole lesson w comments do now introduction.

Learning objectives students will be able to. Lithospheric plate with oceanic crust is dragged down at trenches. Mantle upwells under mid ocean ridge mor. 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. Arthur holmes in 1930s discussed the possibility of convection currents. National science education standards.