Which evidence originally supported Hess's idea of seafloor spreading in 1968? Younger rocks are closer to mid-ocean ridges.
The destruction of crust occurs at deep-sea trenches.
Oceanic rocks are pillow-shaped when formed.
Rocks across the ocean floor have alternating magnetic stripes.(this is the not the right answer, just took test)

Pluto was once classified as a planet. however, scientists no longer classify pluto as a planet. which is a likely reason for this change? the original hypothesis about pluto was supported. no observations of pluto were made in the past. several planets in outer space were found to be similar to pluto. there were significant changes in scientific knowledge about planets.