Question

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.

Answer 1

By the use of sonar, Hess was able to map the ocean floor and to show that the oceans seafloor is spreading using several evidences.

• Hess Harry was a geologist and navy submarine commander during second world war.

• Part of his study was to show and identify the deepest part of ocean floor.

• In 1946 he had discovered that  hundreds of flat top mountains , per harps sunken islands shape the Pacific ocean.

• This was one of the major discovery evidence that was made by this geologist of the time.

• From the discoveries , Hess established that the rocks, mountains and highlands which are come of the prominent features in the oceans are the determinants when it comes to the depth of the oceans.

Answer 2

Answer:

Different types of evidence supported Hess’s theory of sea-floor spreading: eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves.

This evidence made scientists take a second look at Wegener’s hypothesis of continental drift.

The different types of evidence were:

- Evidence from molten rocks

- Evidence from magnetic strips

- Evidence from drilling samples