The phrasing "the two historical figures" leads me to believe that there's a paragraph or more (or at least a sentence) in your text or in your assignment itself that tells what historical figures are being referred to.
Can you supply more information for us?
Respond to the following scenario:
o Your younger brother is in 5th grade. He comes home and tells you to look at an
animation his teacher showed him in geology class.
o Review the Continents of the Past animation on this week’s aXcess page.
o After viewing the animation, your brother has a look of disbelief on his face, “C’mon,
really? Our whole continent moves? That’s bogus!” Instead of blowing him off like you
usually do, you decide to sit down and educate him about plate tectonics. First, you
give him an overview about two historical figures that contributed to the plate tectonic
theory. Then, you decide to show him how the plates move by boiling a pot of water
(shown on p. 108) and relating it to mantle convection and plate movement.
· Write a 200- to 300-word summary about the two historical figures and the process of
mantle convection and plate movement.
In a couple of Google searches, several names keep coming up: Harry Hess and Xavier Le Pichon and others.
As with all Wikipedia search results, be sure to check out all the external links and further references at the bottom of each Wikipedia page.