Ocean Floor Rocks Are Blank Continental Rocks

Continental crust is broadly granitic in composition and with a density of about 2 7 grams per cubic cm is somewhat lighter than oceanic crust which is basaltic i e richer in iron and magnesium than granite in composition and has a density of about 2 9 to 3 grams per cubic cm.

Ocean floor rocks are blank continental rocks. Continental crust is typically 40 km 25 miles thick while oceanic crust is much thinner. The lack of an explanation for continental drift prevented scientists from believing in the supercontinent called. This explains why ocean floor rocks are generally less than 200 million years old whereas the oldest continental rocks are more than 4 billion years old. The alignment of iron bearing minerals in rock reflect that the earth s has reversed.

Continental rocks are much older. These are ocean floor igneous rocks formed at an ocean ridge. Ocean floor rocks are continental rocks. Continental plates are massively granitic rock oceanic plates massively basaltic rock therefore continental rock is less dense than seafloor rock and has a different chemical and mineralogical.

New sea floor is constantly being create and destroyed. The rocks of eastern unst had a very different origin.