EVERYDAY SCIENCE

Detailed explanation-1: -Dormant volcanoes have not erupted for a very long time but may erupt at a future time.

Detailed explanation-2: -Dormant → Dormant volcanoes are volcanoes that have not erupted in a long time but are expected to erupt again in the future. Examples of dormant volcanoes are Mount Kilimanjaro, Tanzania, Africa and Mount Fuji in Japan. Extinct → Extinct volcanoes are those which have not erupted in human history.

Detailed explanation-3: -Inactive volcanoes that have not erupted for an amount of time but can’t be called extinct are dormant volcanoes. They can be called “sleeping” volcanoes. ( see Thinkquest for more) Inactive volcanoes which have not erupted since the beginning of recorded history are extinct volcanoes.

Detailed explanation-4: -Volcanoes go dormant because magma from the Earth’s mantle can no longer reach the volcano. For example, in Hawaii, the line of islands are slowly moving to the northwest. Meanwhile, the supply of magma stays in the same place within the Earth, which currently happens to lie beneath the Big Island.

Detailed explanation-5: -There are four types of eruptions with properties determined mostly by the silica content of magma, and the amount of gas it contains. In order of increasing explosiveness, these are Hawai’ian, Strombolian, Vulcanian, and Plinian eruptions.