quiz Flashcards
why was his theory forgotten
he couldn’t prove it
who came up with the theory of sea floor spreading?
Harry Hess
where does sea floor spreading happen?
mid ocean ridge
what material forms new ocean floor
magma
where is old crust melted back into magma?
deep sea trenches
the process of old crust being pulled down and remelted is called what?
subduction
the evidence that rocks closer to the ridge are younger than rocks farther away supports what?
sea floor spreading
what are plate tectonics a combination of
continental drift and sea floor spreading
what are pieces of lithosphere broken into
tectonic plates
what is a boundary where plates move away from each other called
divergent
why are divergent boundaries also called constructive?
because something new is being made
what is a deep crack in the earth’s surface called?
fault
what evidence did he have?
the fossils and rock layers matched
