How is oceanic crust generally compared to continental crust?

Correct answer: Thinner and denser

Oceanic crust is generally thinner and denser than continental crust. It is mainly associated with basaltic rocks, which contain relatively heavy minerals, whereas continental crust is generally thicker and has a lower average density. Because oceanic crust is denser, it commonly lies lower and can be pushed beneath less-dense continental crust at a subduction zone. Thus, option B correctly gives both comparisons.

The question asks for the general relationship, not an exception or a special local case. Oceanic crust is usually only a few kilometres thick compared with the much thicker continental crust, and its average density is higher. Option A reverses both properties, option C ignores the difference, and option D is scientifically false because crust is made of rocks, not only ice. Therefore, “thinner and denser” is the correct description.