What built the volcano mauna loa?

Answer 1

A hotspot under the volcano built Mauna Loa as well as the rest of Hawaii. Magma was forced out of the hotspot and onto the surface of the ocean. It eventually built up into a mound and over time became a mountain.

Answer 2

Mauna Loa was built by repeated eruptions of lava over hundreds of thousands of years. As the Pacific tectonic plate moves over a hotspot in the Earth's mantle, magma erupts through the crust to form the volcano. The lava builds up layer by layer, eventually creating Mauna Loa, one of the largest volcanoes in the world.

Answer 3

lava built up at the bottom and it got bigger after time.