Spread the marinara sauce on the
crust, then arrange the optional tomatoes
over it (this is a great thing to do when
late summer tomatoes are abundant).
The three ancient Yellowstone supervolcano eruptions were only the
latest in a series of more than 140 as the North American plate of Earth's
crust and upper mantle moved southwest
over the Yellowstone hotspot, starting 17 million years ago at the Oregon - Idaho - Nevada border.