Question

Air thermals are updrafts of warm air that rise from

the ground into the sky. By flying in a spiral pattern
birds are able to ride these air currents to higher
altitudes.

What process enables birds to fly to higher altitudes without flapping their wings,
while riding these air thermals?

A. convection because warm air sinks and cool air rises.

B. convection because warm air rises and cool air sinks.

C. conduction because warm air sinks and cool air rises.

D. conduction because warm air rises and cool air sinks

Answer 1

B. convection because warm air rises and cool air sinks.

Step-by-step explanation:

The processes that enables birds to fly to higher altitudes without flapping their winds while riding air thermals is called convection.

Convection is one of the forms of heat transfer usually found in gases and liquids.

• In convection density differences due to temperature changes causes the circulation.
• Warm air is less dense and it is hotter.
• It rises up from the surface where it is warmed
• Cold air sinks to replace the warm air. Cold air form when the air loses its energy to the surrounding.
• By virtue of this, birds are able to take advantage of it for their flight.