topic+1+q+1


 * What are some alternative theories to plate tectonics that explain geologic activity (earthquakes, volcanoes, etc.)?

2) What is the main idea of theory of plate tectonics? The theory of plate tectonics started back in 1915 when Alfred Wegener thought of "conitental drift". He noticed that some of the contients looked like they could fit together like puzzle pieces. []


 * What are tectonic plates?
 * Give examples.
 * Describe the difference between oceanic crust and continental crust
 * What evidence is there to support this theory? What kinds of evidence led to its acceptance by the scientific community?
 * How do scientists explain how the plates move? About how fast are these plates moving?