Question

\what is the moon made of?\
by andrea jones
the lunar core
at the moons center is a dense, metallic core. this core is largely composed of iron and some nickel. the moons core is relatively small (about 20% of its diameter) compared to other terrestrial worlds (like earth) with cores measuring closer to 50% of their diameters.
what is the central idea from the excerpt of the article \what is the moon made of?\
crystals formed in the magma once it cooled.
the center of the moon is a small core that is made up of mainly two types of metals.
other planets have larger cores.

Explanation:

The text focuses on the moon's core. It describes the core as dense and metallic, composed mainly of iron and nickel. It also compares the moon's core size (about 20% of its diameter) to cores of other terrestrial worlds (closer to 50% of their diameters). The first option about crystals in magma is not mentioned in the text. The third option "Other planets have larger cores" is too vague compared to the detailed description of the moon's core composition and size in relation to its own diameter and other terrestrial worlds. The second option directly aligns with the key details about the moon's core composition (two main metals - iron and nickel) and its nature as the moon's center.

Answer:

The center of the moon is a small core that is made up of mainly two types of metals.