What is a sediment source from volcanic eruptions called?

• A. Volcanic Ash
• B. Sand
• C. Silt
• D. Coral Fragments

Answer: (A)

Volcanic eruptions eject fine, powdery particles that become sediment. This material is called volcanic ash, a type of tephra. It can be carried by wind, settle over broad areas, and form ash beds in the sediment record. Sand and silt are typical sediment sizes produced mainly by weathering and erosion, not specifically by eruptions, and coral fragments come from marine organisms. So, the sediment source from volcanic eruptions is volcanic ash.