What is juvenile water?

• A. Derived from magma that comes to the surface for the first time
• B. Derived from rainfall
• C. Water from meteoric sources
• D. Groundwater dissolved from minerals

Answer: (A)

Juvenile water is water that originates from deep within the Earth's interior and is released as magma degases or erupts. As magma moves upward and crystallizes, water dissolved in the melt exsolves into vapor and hydrothermal fluids, reaching the surface for the first time. This magmatic origin distinguishes it from water derived from rainfall (meteoric water) or groundwater minerals, which come from surface processes or rocks rather than the Earth's interior. So the best description is water derived from magma that comes to the surface for the first time.