Convection, sea breeze and radiation
Answers are for parents and teachers.
1
Draw and label a convection current in a beaker of water heated at one side by the Sun (use arrows).
Warm water rises on the heated side, cools at the top, and sinks on the other side, forming a loop.
2
Explain why the sea breeze blows during the day.
Land warms faster, its air rises, and cooler sea air flows in.
3
Choose conduction, convection or radiation: (a) a metal spoon warming in tea, (b) warmth from a bonfire felt on your face, (c) warm air rising over a sunny field.
(a) conduction, (b) radiation, (c) convection.
4
Why do people in hot countries often wear light-coloured clothes?
Light colours reflect more radiation, so less heat is absorbed.
5
Find the mistake: “Radiation needs air, so the Sun’s heat cannot cross space.”
Radiation needs no material; it crosses empty space.