Answer the following questions:

Name the types of volcanoes on the basis of frequency of eruption.

The three types of volcanoes on the basis of eruption are:

• Active volcanoes: these are volcanoes that are active and hence, constantly eject lava, gases, ashes, etc. There are about 600 active volcanoes in the world.

Example: Mt. Stromboli and Mt. Etna in Italy, St. Helens in USA, Mauna Loa in Hawaiian Islands, Pinatubo in Philippines, etc.

• Dormant volcanoes: there are volcanoes that have erupted in the past and are likely to erupt again but have remained inactive for fairly long periods.

Example: Mt. Vesuvius in Italy, Mt. Fujiyama in Japan, Mt. Kilimanjaro in Tanzania, Mt. Krakatoa in Indonesia, etc.

• Extinct volcanoes: these are volcanoes that were active in remote geological periods, and are not likely to be active once again.

Example: Gorongoro in Tanzania, Arthur’s Seat in Scotland.