Question

question 30
what hypothesis states that the continents were once joined to form a single supercontinent?

plate tectonics
seafloor spreading
continental drift
paleomagnetism

Explanation:

The question asks for the hypothesis stating continents once formed a single supercontinent. Continental drift (proposed by Alfred Wegener) specifically posits that continents were once joined as Pangaea and have since drifted apart. Plate tectonics is a broader theory explaining movement mechanisms, seafloor spreading is evidence for plate tectonics, and paleomagnetism is a method to study past magnetic fields (also evidence).

Answer:

continental drift