Mauna Loa, the world’s largest volcano, is erupting. Here’s why and what will happen next.

Video taken Nov. 28 shows the extent of lava flow from Hawaii's Mauna Loa after it erupted one day earlier. (Video: The Washington Post)
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For the first time in a generation, lava began flowing from Mauna Loa at the heart of Hawaii’s Big Island late Sunday. No one knows when it will stop, or what, if any, damage it might cause.

But there is a lot we do know about the more than 700,000-year-old volcano, and others like it.

Hawaii’s Mauna Loa volcano erupts for first time in 38 years

Here are some answers to common questions about the geologic marvel.