Ash flows are the most destructivetype of volcanic activity.
Today there are about 500 active volcanoes in the world.
If you know why something happens it will be easier to predict future plate tectonic movement by looking for the signs of an approaching earthquake or volcanic eruption and so minimizing the danger by taking the actions necessary because so far it is impossible to stop them and if it were the earth would not be able to release its underground pressure and shake itself...
The volcanic landscape of Mustafar.
The active Hawaiian volcanoes have received special attention worldwide because of their frequent spectacular eruptions, which can be viewed and studied with a relative ease and safety....
The destruction caused by gaslighting
Nyiragongo, Democratic Republic of Congo (2002)
Nyiragongo erupted on January 7th 2002, destroying 15% of the city of Goma. Nyiragongo is well known for its large volumes of lava flows that cause devastation and destruction to anything in its path. In 2002 the lava flows spilt the city of Goma into sections, killing 147 of which 50 died during a petrol station explosion. The eruption also destroyed 14,000 homes, left 75% of the population displaced and led to the evacuation of 400,000 people.
An eruption in 1977 also killed an estimated 2000 people and destroyed villages in its path.
The volcano is active today, however due to the activity being confined to the crater, no victims have been claimed. When the next disaster will occur will only a matter of time.
and uplift and destruction caused by collision
Many of Kilauea's pre-1924 explosive eruptions that produced significant ash deposits probably happened when the volcano's summit crater was so deep that its floor was below the water table, letting ground water seep in to form a lake. Whenever magma erupted into the lake water, violent explosions of steam and volcanic gases resulted. These explosions fragmented the magma into tiny ash particles and drove ash-laden steam clouds (pyroclastic surges), like those that killed Keoua's warriors, out of the crater at speeds as great as 100 miles an hour (160 km/h).