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

One key piece of evidence for **seafloor spreading** comes from **drilled core samples** of the oceanic crust. Here's how they provide support: - **Age Distribution**: Core samples reveal that the age of the oceanic crust increases with distance from mid-ocean ridges. This pattern is consistent with new crust being formed at the ridges and then spreading outward. - **Composition**: The chemical and mineral composition of these cores matches predictions for newly formed crust at divergent boundaries, further supporting the seafloor spreading model. Other options, such as fossil material or continent material, are more directly related to the movement and alignment of continental plates rather than the specific process of seafloor spreading. Ocean water samples can provide indirect evidence, such as heat flow measurements, but drilled core samples offer more direct and concrete evidence. **Answer:** Drilled core samples