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north america at all the other continents seemed to stay in the same
locations year after year
actually however the continents are moving slowly relative to one another
in the past two hundred million years the continents have moved from the
location shown
the theory of plate tectonics accounts for this movement
according to this very the continents and oceans stores are parts of about
thirty plates the largest of which are shown
each plate consists partly of crust the outermost layer of the earth
and partly of mental of thick layer of hot rock
the plates slide on the asthenosphere is here
a layer of mental that is so hot it flows even though to remain silent
two hundred million years ago all the continents were parts of a single land
mask called Pangea
Pangea break apart into mass is called Laurasia and Gondwanaland
intern Laurasia and Gondwanaland broke apart
one piece of Gondwanaland, India
later joined asia
in the next fifty million years the continent's may move to these locations