Question

in 1968, the deep sea drilling project began extracting sediment cores from the ocean floor. analysis of these cores has since shown that the ocean basins are very young compared to the accepted age of the earth. no rocks older than 180 million years have been found. the cores further indicate that ocean sediments are absent at the mid-ocean ridge and get thicker moving away from the ridge. this evidence helped to confirm what aspect of the plate tectonic theory? options: paleomagnetic reversals, existence of land bridges, location of the lithosphere, sea-floor spreading

Explanation:

The Deep Sea Drilling Project's findings (ocean basins young, no old rocks at ridges, sediments thicken away from ridges) align with sea - floor spreading. Sea - floor spreading says new oceanic crust forms at mid - ocean ridges and moves away, so sediments accumulate farther from ridges and oceanic crust is relatively young. Paleomagnetic reversals involve magnetic field changes, paleozoic land bridges are about ancient land connections, and the lithosphere's location is not related to these sediment and age findings.

Answer:

sea - floor spreading