Question

which is one piece of evidence of seafloor spreading?
○ fossil material
○ continent material
○ drilled core samples
○ ocean water samples

Explanation:

Seafloor spreading is supported by evidence that shows the ocean crust forms at mid-ocean ridges and moves outward. Drilled core samples reveal that oceanic crust is youngest near ridges and gets older with distance from them, directly demonstrating seafloor spreading. Fossil and continent material relate more to continental drift, while ocean water samples do not provide evidence of crust movement.

Answer:

C. drilled core samples