The new crater lake at Kīlauea’s summit, spotted on August 15, 2019. M. Patrick, USGS-HVO

Over the last few weeks, we’ve had two newsworthy events that involve volcanoes and water. This is a common combination on our planet and can have dramatically different results. One is a very small feature that’s new to one of the most active volcanoes on Earth. The other is now a large feature spreading across the Pacific that came from a previously unknown volcano under the sea.

First, the small: