Question

Which statements about Earth’s crust are true? Check all that apply. The crust includes soil, rock, and water. There are three different kinds of crust. The crust is thickest under the ocean. The ocean crust is made of young rocks. The ocean crust is denser than continental crust.

Answer 1

Answer:

Options (1), (4) and(5)

Explanation:

The earth's lithosphere is divided into two types of crust, that are commonly known as-

• Continental crust- It has a thickness of about 35-40 km and is comprised of minerals such as silicates, alkali feldspar that is less dense in nature.

• Oceanic crust- It has a thickness of about 7-10 km and is comprised of denser minerals such as olivine, pyroxene, and potash feldspar.

Both the type of crust are comprised of water, rock as well as soil. The rocks of oceanic crust are much younger than the continental crust because the oceanic crust is formed from the seafloor spreading where the new materials are added to the crust along the mid-oceanic ridge. The rocks at this boundary are the youngest. On the other hand, the continental crust is the oldest and is present from the time of the formation of the earth. The denser oceanic crust subducts below the lighter continental crust in a convergent plate boundary.

Thus, the correct answers are options (1), (4) and(5).

Answer 2

Answer:

The crust includes soil, rock, and water.

The ocean crust is made of young rocks.

The ocean crust is denser than continental crust.