Answer: Sea floor spreading was supported by the following contributions, such as-
- The convection current at the mantle forces the plates to move against and towards each other.
- Rocks at the mid-oceanic ridge are younger than the rocks that are away from it.
- The alternating bands of magnetic field suggested that the poles were continuously shifted during each spreading time.
- Materials collected from the mid oceanic ridge has been dated and determined the average age of those rock.