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These is a drawing of the interior of Io.
Click on image for full size
NASA

Interior of Io

The diagram to the left shows the interior of Io.

When the Galileo spacecraft flew by Io it took measurements which showed that Io was separated into two layers, as shown in this picture.

Thus scientists think that Io has a large core, covered with a rocky material. There is no ice within Io.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF