Looks like a plass factory on fire or a big volcano vent.

For example, scientists working with 10-year-old data recently constructed the clearest picture yet of the biggest volcano on Mars.

The calderas of the four big volcanoes would stay especially pure in such a world, or so they say.

As we all know now, it is a very, very big volcano.

It is easy to believe they stand on the flank of the biggest volcano in the solar system.

"If the situation lasts for the next six or seven months, the American administrators will feel like they're sitting on a big volcano," he said.

A line of big volcanoes extends north and south, with the green coastal plain below.

But their desire for the solace, challenge and sense of mortality found on the big, dormant volcano seems to have diminished little.

He looked at the rosy rim of the big volcano.

Etna is a big volcano, much the highest in Europe, and it has a record of activity going well back into history.