Why do geologists drill through the oceanic crust in their attempt to reach the mantle? it is softer than the continental crust. it is thinner than the continental crust. it is younger than the continental crust. it is less dense than the continental crust.

Amountain created from tectonic activity would be considered which type of landform ? a) primary landform b) secondary landform

What events caused the united states to intervene in southwest asia?

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.