If scientists wanted to date the oldest rocks on Earth's surface, why wouldn't they use rocks formed at the Mid-Ocean ridges ?

Explanation:

This is because rocks formed at the mid ocean ridges are young rocks i.e the mid ridges is use to date young rocks. Rocks farther from the mid ridges are older than rocks near the mid ridges and this can also be as a result of the oceanic crust near the mid ridge are younger than the oceanic crust far away from the mid ridge.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.