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