Vanadium
Vanadium is a metal element. Its symbol is V.
Volcano
A volcano is a vent in the earth's crust.
Water
Water is a liquid oxide of hydrogen.
Water table
The water table is the level of ground below which the rocks are saturated with water.
Welding
Welding is the process of joining two pieces of metal together by hammering, pressure or fusion.
Wood's Metal
Wood's metal is a fusible alloy consisting of 50 per cent bismuth, 25 percent lead, 12.5 per cent tin and 12.5 per cent cadmium.