Question

name

1. which type of heat transfer causes the sun to warm the earths surface?

• a. conduction
• b. convection
• c. radiation

1. when you feel warmth from the sun even though youre not touching anything

hot, the heat moves by -

• a. conduction
• b. convection
• c. radiation

1. conduction happens when -

• a. heat moves by touching or direct contact
• b. heat moves through air and water currents
• c. heat travels through empty space

1. when the ground heats the air above it, and the warm air rises while cool air

sinks, this is -

• a. radiation
• b. convection
• c. conduction

1. in the atmosphere, convection currents cause -

• a. the wind to blow and air to move
• b. the suns rays to heat space
• c. the ozone layer to form

Explanation:

• Question 1: Heat transfer from the Sun to Earth occurs through radiation. Radiation is the transfer of energy via electromagnetic waves (like sunlight) and doesn't require a medium (unlike conduction which needs direct contact and convection which needs a fluid medium).
• Question 2: Feeling warmth from the Sun without touching anything hot is due to radiation. The Sun's energy travels as electromagnetic waves (radiation) through space to reach us.
• Question 3: Conduction is defined as heat transfer by touching or direct contact. For example, when you touch a hot pan, heat is conducted from the pan to your hand.
• Question 4: When warm air (less dense) rises and cool air (more dense) sinks (as the ground heats the air above it), this is convection. Convection involves the movement of a fluid (in this case, air) due to density differences caused by temperature variations.
• Question 5: In the atmosphere, convection currents (movement of air due to temperature - related density differences) cause the wind to blow and air to move. Wind is essentially the movement of air from an area of high pressure (cooler, denser air) to an area of low pressure (warmer, less dense air).

Answer:

1. C. Radiation
2. C. Radiation
3. A. Heat moves by touching or direct contact
4. B. Convection
5. A. The wind to blow and air to move