Question

what is the central idea from the excerpt of the article \what is the moon made of?\ other planets have larger cores. 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.

Explanation:

The article's title is "What is the Moon Made of?". We need to find the central idea related to the moon's composition. The first option is about other planets' cores, which is off - topic. The second option is about crystal formation in magma, not directly about the moon's overall composition. The third option talks about the moon's core and its metal composition, which is relevant to what the moon is made of.

Answer:

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