Observations indicate that a large electric current flows through Europa, induced by Jupiter's magnetosphere sweeping over the planet. This requires an electrically conducting medium under the surface. In the case of Europa, this medium is believed to be:

Question

Quizplus · Accepted Answer

Europa is believed to have a subsurface ocean of liquid water, which is believed to be in contact with rocks that contain minerals such as salts and sulfur. The ionization of water molecules in the ocean would provide the necessary conductivity for the electric current to flow through Europa.

Observations Indicate That a Large Electric Current Flows Through Europa