#7. The continents were once joined together in one large mass called...

#7. This later led to the development of the _______ ________ theory.

#8. Pangaea began to break up about ____ million years ago..

#9. Earth's outer layer (including and supporting the crust from below) that is broken into several large slabs called tectonic plates is called...

#9. These plates, which hold the continents and oceans, are _______ but constantly moving.

#9. These plates, which hold the continents and oceans, are slowly but ______________moving.