Atheist:

Aside from evils created by human choice, there are also evils arising from our environment, e.g. earthquakes, volcanic eruptions, lightning strikes, and plagues.

Theist:

Volcanic eruptions are the result of liquid magma at the earth's core. If it weren't for liquid magma, earth wouldn't have a magnetic field, and navigation would be difficult. On the whole, therefore, it is better to have natural dangers than not.

Atheist:

You assume that a liquid magma core is necessary for giving a magnetic field, but this assumption is just false. The existence of a planet having magnetic polarity but no volcanoes is both logically and physically possible, and creating it should be a cinch for the creator of the universe.