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A movement or rising warm air: A thermal is a localized air current that rises aloft when the lower atmosphere is heated enough to produce an instability over a certain area.
When a thermal of a rising current of relatively warm air occurs, it is used by gliders and birds to gain height.
A movement or rising warm air: A thermal is a localized air current that rises aloft when the lower atmosphere is heated enough to produce an instability over a certain area.
When a thermal of a rising current of relatively warm air occurs, it is used by gliders and birds to gain height.
A movement or rising warm air: A thermal is a localized air current that rises aloft when the lower atmosphere is heated enough to produce an instability over a certain area.
When a thermal of a rising current of relatively warm air occurs, it is used by gliders and birds to gain height.
A movement or rising warm air: A thermal is a localized air current that rises aloft when the lower atmosphere is heated enough to produce an instability over a certain area.
When a thermal of a rising current of relatively warm air occurs, it is used by gliders and birds to gain height.
A movement or rising warm air: A thermal is a localized air current that rises aloft when the lower atmosphere is heated enough to produce an instability over a certain area.
When a thermal, or current of relatively warm air rises, it is advantageous for gliders and birds to gain height.
This entry is located in the following unit:
-al; -ial, -eal
(page 20)