subduction
what happens during subduction
land gets recycled
when was Hess born?
1906
What is magma?
a hot liquid in the earths mantle
where does subduction happen
how did Hess discover his accomplishment in 1945
Sonar
What does convergent boundary mean
When two plates move towards each other
why does subduction happen
it happens because two plates that are different densities collide
what did Hess propose in 1960
sea floor spreading
What does divergent boundary mean
When two plates move away from each other
what is affected by subduction
Fossils, The seafloor.
what was Hess' connection to Wegner's theory of continental drift
seafloor spreading causes continental drift
What is a sonar
a device that shows depth
When was subduction discovered?
1970
what did Hess discover in 1945
mid-ocean ridge
What is a trench?
it is a giant crack in the middle of the ocean