Yellowstone is Still Hot
Yellowstone National Park sits over a hotspot, a place in the Earth's crust where magma sits close to the surface. The Yellowstone Supervolcano, which sits over the hotspot, has had three caldera-forming eruptions: 2.1 million years ago, 1.3 million years ago and 640,000 years ago.
Magma continues to build beneath Yellowstone. It's a question of when, not if, it erupts again. (Chances are good that we have 90,000 years or so before that happens, but geologists monitor the area just in case!)
Calderas in Space
Earth isn't the only planet that has calderas. Other planets have them as well, including Venus and Mars. The moon also has calderas.
volcano that has had a recorded eruption since the last glacial period, about 10,000 years ago.
not identical on both sides.
large depression resulting from the collapse of the center of a volcano.
deepest part of a shallow body of water, often a passageway for ships.
physical, cultural, or psychological feature of an organism, place, or object.
edge of land along the sea or other large body of water.
group of structures or parts that are somehow related.
to contain or be made up of.
bowl-shaped depression formed by a volcanic eruption or impact of a meteorite.
remains of something broken or destroyed; waste, or garbage.
indentation or dip in the landscape.
width of a circle.
unique or identifiable.
state of minimal growth or activity.
length of time.
to get rid of or throw out.
having the shape of an oval.
conditions that surround and influence an organism or community.
occurring sporadically or irregularly.
violent outburst; rejection, usually of gases or fuel
overflow of a body of water onto land.
having to do with the physical formations of the Earth.
rising or falling by a small amount.
increasing in regular additions.
measure of magnitude.
body of land surrounded by water.
body of water surrounded by land.
molten rock, or magma, that erupts from volcanoes or fissures in the Earth's surface.
phenomenon where lava is forcefully but not violently ejected from a volcano through a fissure or vent.
to find or identify a place.
underground reservoir that holds molten rock.
very large or heavy.
constant or lasting forever.
powerful, violent volcanic explosion characterized by pyroclastic flows and ejection of material high into the atmosphere.
current of volcanic ash, lava, and gas that flows from a volcano.
depression caused by the collapse of an underground magma chamber not affiliated with a particular volcano; the largest volcanic structures on Earth.
natural substance composed of solid mineral matter.
large, gently sloping volcano made from fluid lava.
precipitation made of ice crystals.
steep volcano made of hardened lava, rock, and ash. Also known as a composite volcano.
to return to a lower level.
highest point of a mountain.
flat surface created on a steep hillside.
elevation of the Earth's surface due to tectonic or other natural activity.
huge and spread out.
craft for traveling on water, usually larger than a rowboat or skiff.
strong, destructive force.
fragments of lava less than 2 millimeters across.
hill created by a volcanic eruption.
activity that includes a discharge of gas, ash, or lava from a volcano.
opening in the Earth's crust where lava and gases escape to the Earth's surface or atmosphere.