Plot data on a diagram.
Seafloor spreading pdf.
The older rock is close to 400 million years.
Mantle upwells under mid ocean ridge mor.
Students will make their own models of seafloor spreading and the magnetic strips that occur in the seafloor.
This process occurs along divergent plate boundaries at areas called mid ocean ridges.
Seafloor spreading is the creation of new seafloor or new oceanic crust 5.
Mantle convection is the slow churning motion of earth s mantle.
Arthur holmes in 1930s discussed the possibility of convection currents.
Sea floor spreading entire lesson pdf version sea floor spreading whole lesson w comments do now introduction.
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.
Learning objectives students will be able to.
Students still enter the same way they quietly get to their seats and take.
Seafloor spreading and other tectonic activity processes are the result of mantle convection.
Have students pick up materials needed for the activity.
The oldest sections should be the sections on both sides furthest from the middle 4.
The strips of paper represent oceanic crust or seafloor.
Convection current theory convection current theory is the soul of seafloor spreading theory.
Lithosphere with new oceanic crust is formed at mor then spreads laterally as if on conveyor belt.
Formally proposed by dietz 1961 and hess 1962.
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.
Make predictions about future events related to this data.
The center slit represents a mid ocean ridge 2.
Convection currents also recycle lithospheric materials back to the mantle.
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.
Draw conclusions from the data.
Lithospheric plate with oceanic crust is dragged down at trenches.
60 cm long paper strip 1 compass 1 box of markers 1 cardboard box lid 1 bar magnet meter stick or ruler 3.
They will also model sea floor spreading at a spreading center such as the mid atlantic ridge.
Examine sea floor spreading.
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.
To understand the concept of seafloor spreading we must first understand some basic concepts that form the cornerstones for the concept of seafloor spreading.
Have students work in groups of four.
The best known ridge on the globe runs straight down the.
These cornerstones are convectional current theory and paleomagnetism.
Convection currents carry heat from the lower mantle and core to the lithosphere.
The earth does not get bigger.
