What is a quiet volcano?

Answer 1

Quiet volcanoes explode with much less suddenness, because lava does not cool and harden. The lava that creates a quiet volcano is still runny and flowing, and do not plug the craters and trap huge quantities of explosive gas. However, pockets of hot gas form that squirt fountains of lava into the air. Because lava flows away before hardening, broad sheets of lava and wide, gently sloping domes are formed around the volcano. When the lava has dried, it forms a rock known as basalt.

Answer 2

A quiet volcano is one with a very fluid lava, or low viscosity lava, where pressure is not built up to explosive levels. A quiet volcano could also refer to a dormant volcano, one which is not currently erupting but has the potential to do so.
Quiet volcanoes are usually called 'dormant volcanoes' or sleeping volcanoes.

Answer 3

explodes with less force than explosive volcano because it does not cool and harden

Answer 4

During a "quiet" or effusive eruption lava pours out of a vent and flows downhill, but there is little or no explosive aspect to the eruption.