Please enable JavaScript.
Coggle requires JavaScript to display documents.
Plate Techtonics (Continental Drift (Fit Like A Puzzle (if we could…
Plate Techtonics
Continental Drift
-
-
Ancient Climates
in antartica we have found great supplies of coal. coal can only be formed through compaction and decomposition of plants. Plants cant grow in the extreme weather of antartica. So that means that it had to have a tropical weather.
-
-
-
Magnetic Reverse
We know the see floor is spreading because of mid-ocean ridges. which we partly know of magnetic revers because of the layers of rock
when we have a magnetic reverse the poles change and at a mid-ocean ridge we can test the rocks using positive and negative charges based on which north
-
-
Hot spots
-
-
-
-
Can trace the islands back and know where plates have gone #
-
-
Bondaries
-
-
Divergent Boundary
-
-
-
Cause mid- ocean ridges # #
-
-
How does It work?
Convection Currents
-
Gravity pulls the more dense magma down then it goes almost to the core cools and becomes less dense and rises and just repeats the process and moves the plates
-
-
Density changes
-
Magma is forced up, cooled then dropped its density changes through heat
-
-
