Explanation:

• Seafloor spreading is a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other. Seafloor spreading and other tectonic activity processes are the result of mantle convection. Mantle convection is the slow, churning motion of Earth's mantle.
• As per a study, seafloor spreading influences sea level and carbon cycle. For example, faster rates mean more volcanic activity, which injects greenhouse gases into the atmosphere.

Hence both statements are correct.