The biggest volcano is Olympus Mons on Mars
The biggest volcano is Olympus Mons on Mars
But if you mean biggest on Earth:
By size and volume:
Olympus Mons - Mars
- Height: about 22 km, 13.6 miles. That is nearly 3x taller than Mount Everest
- Width: about 600 km across, roughly the size of Arizona
- Type: shield volcano. It is so big it covers an area bigger than the whole country of Poland
Biggest on Earth:
1. Mauna Loa - Hawaii
Height: 4,169 m above sea level, but 9,170 m from ocean floor to summit
Volume: biggest volcano on Earth by volume and area. It makes up half of Hawaii's Big Island
Still active
2. Tamu Massif - Under the Pacific Ocean
It is technically the largest by area. About 310,000 sq km
But it is extinct and underwater
Fun fact: Because Mars has lower gravity and no plate tectonics, lava could keep piling up in one spot for millions of years. That is why Olympus Mons got so huge.

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