Science question?

Question

Rocks under the ocean are more dense than the ones that make up mountains.


A. TRUE B. FALSE

Answer 1

True. You may think it's the pressure of ocean water, but it isn't. The rocks of the continents are less dense, so they float higher on the Earth than the rocks of the oceans. The continents are a lighter granitic rock, while the oceans have a more dense basaltic rock. They are different compositions, and the pressure of the water is irrelevant.

Answer 2

generally true
because of the processes of plate tectonics the lighter granitic rocks become concentrated into the continental masses, and the more dense basaltic rocks remain beneath them and between them as part of the ocean floors.
the lava that is produced at the mid-ocean ridges is generally of a basaltic nature, this is what the sea floors are made of.
in many cases, the material erupted from continental volcanoes is largely made up of re-melted granitic rock from within the continental mass itself
because of the forces and density involved with rock structures, the depth and pressure of water is of little real consequence. If there were no water, the dense rocks would lie in the lower/depressed areas of the surface, and the lighter rocks would be "floating" on them to produce 'highlands'

Answer 3

True. The oceanic crust is primarily basaltic, which is very dense. As a result, at subduction zones, the more dense oceanic plate subducts underneath the less dense continental plate

Answer 4

This is true. Ocean water compresses oceanic lithosphere, which makes it denser than continental lithosphere. Oceanic-Continental is the most common major convergent plate boundary. This is also known as a subduction zone, as the ocean plate subducts under the continental plate.

Answer 5

true. the ocean waters compress the rocks so that it's packed tightly and so are dense.

Answer 6

false, the Diamond is the hardest mineral which is found in coal mines, which of course can be in mountains.

Answer 7

a