_____proposed theory of continental drift in 1912
One piece of evidence that supports Wegner, all continents look like they fit together like a ________
Evidence 2-different continents have the same_____from plants and animals
rocks from different continents have the same glacial_____
rocks on different continents are similar in ____, ______
possible explanation by Wegner was Earth's ________
occupation of Wegner
mid-atlantic ridge was discovered by mistake using______
proposed theory of seafloor spreading in '60s
theory that all continents were once connected but have drifted apart
theory that hot, less dense material below crust rises to surface at ridge; then flowing sideways carrying sea in both directions
_________ rocks are closest to ridge, _________ are furthest away(age, age)
manetic field change ( reversal is recorded in rocks around ridge)
ridge splits this country in 1/2
combines continental drift and seafloor spreading , crust is broken up into plates move on plastic layer of astenosphere
Plates move apart
plates move together
plates slide past
cause magma to rise and cool at surface, causing a current that moves plates
occur at all boundaries
occur at subduction zones, divergent underwater
form at convergent boundaries
Deep sea trenches
form at convergent and push down into mantle
occur when plates pull apart
type of crust that that is more dense than continental
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