According to the processes described in paragraph 1, what is the relationship between radioactivity and the steam produced by geothermal heat?

• Geothermally heated steam is produced when water is exposed to radioactivity deep underground.
• When water is introduced into holes drilled thousands of feet in the ground, it becomes radioactive and turns to steam.
• Radioactivity heats Earth's interior rock, which in turn can heat water to the point it becomes steam.
• When a reservoir of steam in subsurface rock is produced by radioactivity, it is said to be geothermally heated.

This is a multiple choice.