5 Theories on the Origins of Continents, etc...

2. Alfred Wegener

7. PRESENT DAY

8. WATCH “SUBDUCTION”

10. Reconstructing
Plate Motions:
The Continental Fit

12. A volcano forms when magma beneath the Earth's crust forces its way
to the surface. Alternating layers of solidified lava and pyroplastic
materials build up the typical shape of a volcano as they are ejected
through the central vent during eruptions.