How does a scientist know how to draw isochrons to connect basalt flows on land with the ocean floor

 Sea-floor spreading — In the early 1960s, Princeton geologist Harry Hess proposed the hypothesis of sea-floor spreading, in which basaltic magma from the mantle rises to create new ocean floor at mid-ocean ridges. ... A test of the hypothesis of sea-floor spreading was provided by studies of the Earth's magnetism.

The Beginning of 1960s, Princeton geologist Harry Hess suggested the sea-floor spreading theory, in which basaltic magma rises from the mantle to create new ocean floor on mid-ocean ridge. Studies of the Earth's magnetism have provided a test of the sea-floor spreading hypothesis.

i only have few minutes according to the map above, which shows religious cultural regions, what two religions are most commonly practiced in africa? a. christianity and buddhism b. buddhism and hinduism c. islam and christianity d. hinduism and islam