GEOLOGY

Detailed explanation-1: -Shield volcanoes They are the world’s largest active volcanoes, rising over 9 km above the sea floor around the island of Hawai’i.

Detailed explanation-2: -Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption.

Detailed explanation-3: -Volcanic ash is a mixture of rock, mineral, and glass particles expelled from a volcano during a volcanic eruption. The particles are very small-less than 2 millimeters in diameter. They tend to be pitted and full of holes, which gives them a low density.

Detailed explanation-4: -By far the most abundant volcanic gas is water vapor, which is harmless. However, significant amounts of carbon dioxide, sulfur dioxide, hydrogen sulfide and hydrogen halides can also be emitted from volcanoes.