Which statements describe oceanic crust? select the two correct answers. a. it contains silicate materials high in iron and magnesium. b. it is made of all types of rocks. c. it is between 25 and 70 km thick. d. its age ranges from very young to more than 4 billion years old. e. it is formed at zones of volcanic activity on the ocean floor.

A. It contains silicate materials high in iron and magnesium.

E. It is formed at zones of volcanic activity on the ocean floor.

Explanation:

    Oceanic crust is the name given to the terrestrial lithosphere layer, with specific characteristics of composition, thickness and differentiated densities, which constitute the bottom of the ocean basins. This together with the Continental Crust constitute the Earth Crust, yet they are completely distinct in composition, thickness and geological history.

Characteristic and its Composition:

reflecting point a across the origin negates both of its coordinates.

b = (5, -4)