Explanation:
Yellowstone Caldera is considered a supervolcano because of its massive past eruptions and large magma chamber.

Explanation:
A volcanic vent is the opening in the Earth's crust where lava, ash, and gases are expelled.

Explanation:
Mauna Loa in Hawaii is the largest volcano on Earth, covering nearly half of the island of Hawaii.

Explanation:
Obsidian is a volcanic glass formed when lava cools rapidly, preventing crystal formation.

Explanation:
The 1980 eruption of Mount St. Helens was one of the most destructive eruptions in U.S. history.

Explanation:
Hurricanes are not volcanic hazards; volcanic hazards include lava flows, pyroclastic flows, ash, and lahars.

Explanation:
Volcanic eruptions occur when pressure from gases in the magma becomes too great, forcing it to the surface.

Explanation:
Pahoehoe lava cools to form smooth, ropy surfaces, unlike Aa lava which is rough and jagged.

Explanation:
Mount Etna in Sicily is one of the world’s most active volcanoes.

Explanation:
Composite volcanoes (stratovolcanoes) are made of alternating layers of lava, ash, and volcanic rocks.

Explanation:
Mount Vesuvius erupted in AD 79, covering Pompeii and Herculaneum with ash and pumice.

Explanation:
A lahar is a destructive volcanic mudflow formed from ash, debris, and water.