Apyroclastic flow typically occurs during a quiet eruption.

That is False. A pyroclastic Flow typically occurs during a explosive erupiton. No Pyroclastic flows are a product of explosive eruptions. Pyroclastic flow typically occurs during a violent eruption. No. A "quiet" eruption will produce lava flows. Pyroclastic flows generally. Result from explosive eruptions. Yes. A pyroclastic flow is essentially a sort of avalanche of hot ash, rock, and gas ejected by an explosive volcanic eruption. The answer is Explosive . It is explosive because during a explosive eruption there are clouds of ash, gas , and rock , and with a pyroclastic flow there is dust and ash . there for the answer must be explosive . Explosive eruptions That depends on the sense in which you mean silent. Pyroclastic flows are generate by explosive rather than "quiet" eruptions. However, no sound escapes the flows themselves. Their unusual acoustic properties ensure that the sound they produce remains trapped inside.

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.