How are the crust and the inner core alike?

At the center of the earth, and under pressure-together make up 1/3 of the Earth's mass

Explanation:

The Earth's Crust is the smallest and most external among the layers of the planet Earth. It is here that the transformations of the relief take place and where all the internal and external processes that cause its formation and transformation are expressed morphologically.

The inner core of the Earth, in turn, is essentially a large ball of crystallized solid iron, located some 5,000 kilometers below the Earth's surface. At about 2400 kilometers in diameter, it is smaller than the Moon.

These two, have some things in common, among them we can mention that in the center of the earth, and under pressure, together they form 1/3 of the Earth's mass.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.