Which statement correctly explains why a convection current is created in a fluid when it is heated from below?
The heated fluid expands, becomes less dense, and rises.
The individual molecules in the heated fluid expand and float upwards.
The heated fluid contracts, increases in density, and rises.
The pressure at the top of the fluid increases, forcing the hot fluid upwards.
73 exam-style questions on CIE IGCSE Physics 2.3.2 Convection. Each one has a worked solution and a mark scheme showing where the marks go.