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