GEOLOGY

Detailed explanation-1: -Volcanic eruptions can be explosive, sending ash, gas and lava high up into the atmosphere, or the magma can form lava flows, known as effusive eruptions. Whether an eruption is explosive or effusive largely depends upon the amount of gas in the magma.

Detailed explanation-2: -Some volcanic eruptions are explosive and others are not. The explosivity of an eruption depends on the composition of the magma. If magma is thin and runny, gases can escape easily from it. When this type of magma erupts, it flows out of the volcano.

Detailed explanation-3: -In effusive eruptions, lava flows are relatively calm and do not explode out of the volcano.

Detailed explanation-4: -Pacana Caldera. Volume of erupted tephra: 2, 500km3. Whakamaru. Volume of erupted tephra: 2, 000km3. Taupo. Volume of erupted tephra: 1, 170km3. Cerro Galán. Volume of erupted tephra: 1, 050km3. Yellowstone Creek. Volume of erupted tephra: 1, 000km3. Long Valley Caldera. Volume of erupted tephra: 580km3. Tambora. Crater Lake. More items