• Continental Drift • The theory by Alfred Wegener that continents can drift apart form one another and have done so in the past. Vocabulary • convergent boundary • The area where two tectonic plates push into one another. Vocabulary • convergent boundary • The area where two tectonic plates push into one another. Vocabulary • divergent boundaries • The area where two tectonic plates move away from one another. Vocabulary • divergent boundaries • The area where two tectonic plates move away from one another. Vocabulary • transform boundaries • The area where two tectonic plates slide past each other horizontally. Vocabulary • transform boundaries • The area where two tectonic plates slide past each other horizontally. • http://www.classzone.com/books/earth_science/te rc/content/visualizations/es0804/es0804page01.cf m?chapter_no=visualization Vocabulary • constructive forces • Forces that build up, or add to the surface of the Earth. Vocabulary • deconstructive forces • Forces that wear down, or take away material from the surface of the Earth.