No. Pahoehoe is considered a lava flow. Pyroclastic debris consists of volcanic ash, pumice, and lapilli rather than lava flow material.

No. Soil creep is the very slow movement of soil, taking years to have a noticeable effect.

A debris flow often moves very rapidly.

Possibly a grain of sand or debris in the flow tube.

Rapid downslope movements of debris and dirt that are mixed with rain are landslides. Thick mixtures of mud, water, and debris that moves rapidly or slow depending on conditions is a debris flow.

Air flow through radiator restricted with debris. Coolant flow through inside of radiator restricted with debris.

Low on coolant.

Faulty thermostat.

Coolant fans inop.