Plate Tectonics

• Harry Hess was an American Geologist. He hypothesized that ''the oceanic crust was constantly being formed by the extrusion and solidification of molten material from the earth's mantle along the lengths of the mid-ocean ridges.''
• A continent is a large landmass on the surface of the earth.
• There are 7 continents. Namely, Asia Europe North America South America Antarctica, and Europe.
• The formation of the continents has had a large impact on the distribution and dispersal of flora and fauna. It also played an important role in the evolution of the species as well.
• Related species evolved variations as a response to altered or diverse environment.