A volcano is an opening in the Earth’s crust through which molten lava, red-hot rocks, steam and fumes pour out. An active volcano is one that erupts regularly or has the capacity to erupt. They are sometimes called dormant. If they have not erupted for a very long period. The largest active volcano on earth is Mauna Loa. Its base spreads over 50% of the island of Hawaii Mauna Loa’s summit is 9 Km (5.6 miles) from the ocean floor and scientist estimate that is great mass is actually squashing the ocean floor down by another 8km (5 miles), giving the volcano a total height of just under 17 Km (10.6 miles) from seafloor base to summit. The last time it erupted was 1984.
The Earth’s crust is cracked into pieces that are constantly moving by just a few centimeters each year. The cracked sections called tectonic plates, are supported by the oozing, soft rocks of the mantle beneath the Earth’s crust. The unstable borders between the plates arr knows as “ting of fire”. These are danger zines for both volcanoes and earthquakes.