How is a cycle formed in a convection current?

Correct answer: Hot, less dense material rises and cool, denser material sinks

When a material is heated, it expands, becomes less dense, and rises. As it cools near the top, its density increases and it sinks. This repeated circular movement forms a convection cycle. Option B reverses the movement caused by density differences. Exam tip: hot, less dense material rises, whereas cool, denser material sinks.