What is the sediment source from volcanic eruptions?

• A. Volcanic Ash
• B. Sand Dunes
• C. Coral Debris
• D. Wind-blown Dust

Answer: (A)

Volcanic eruptions release volcanic ash, a fine-grained sediment that settles out of the eruption plume and accumulates as ash deposits on the landscape, lakes, and oceans. This ash can later be compacted or lithified into rock, and it forms widespread tephra layers that are a key sediment source tied to volcanic activity. The other options don’t come directly from eruptions: sand dunes are built by wind-transported sand, coral debris comes from reef organisms, and wind-blown dust originates from nonvolcanic surfaces. So volcanic ash is the sediment produced by volcanic eruptions.