The early hypothesis of _______ was based on observations that suggested continents were once joined together. Later, the theory of _______ explained why large pieces of Earth's surface move around and how many of Earth's features form.

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Hello Ivancortezvilla 

The early hypothesis of continental drift was based on observations that suggested continents were once joined together. Later, the theory of plate tectonics explained why large pieces of Earth's surface move around and how many of Earth's features form.

Hope That helps!
-Chris
The answers are "Continental Drift" and "Tectonic Plates"