geologists
came up with the theory of Pangea
Whis is Wegener ?
the supercontinent
What is Pangea ?
plates collide
What is a divergent boundary ?
an educated guess
what is a hypothesis ?
used a sonar to explore the ocean
Who is Hess?
what is subduction ?
plates move away from each other
What is a divergent plate?
the question scientists ask
what is why?
used fossils to prove his theory
Who is Wegener?
long mountain chains in the ocean
What is mid atlantic ridge ?
Plates move past each other
what is a transform boundaries?
the steps scientist follow when trying to answer questions?
The scientific method
could not prove his theory
Who is Wegener ?
the continent slowly moving over time
What is continental drift ?
these boundaries cause giant rift valleys
what are divergent boundaries?
the number of continents today?
what is 7?
was able to prove Wegener's theory
Who is Hess?
the theory that the earth's plates are in slow, constant motion
What is plate tectonics?
these boundaries cause mountain ranges
the continent that we live on
What is North America?