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

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

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.

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.

the dissolution of polymer can be thermodynamically described in 2 steps.