Which of the following is NOT evidence of recent activity at a volcano?

A) Thick, well-developed soil
B) Layer of ash blanketing hillslopes
C) Unweathered lava flows
D) Ash flows lacking a well-developed soil

Unweathered Lava

Refers to lava that has not been exposed to weathering processes and therefore maintains its original texture and composition.

Well-developed Soil

Soil that has gone through all stages of soil formation, resulting in distinct layers or horizons, and is capable of supporting plant life effectively.

Ash Blanketing

The covering of large areas with volcanic ash following an explosive volcanic eruption.