A convection cell churning near mid-ocean ridges.
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An obtuse angle is an angle between (but not including) 90 and 180 degrees, so some obtuse angles would be 91 degrees, 179 degrees, and 142 degrees.
Examples of convection include:hot air rising, cooling, and fallinga hot air balloonboiled water or boiling waterhot air popperan old fashioned radiator (creates a convection cell in a room by emitting warm air at the top and drawing in cool air at the bottom).steaming beverage
Convection waves are invisible: You can't see them.
In convection less molecules occupy large volume as in air to reduce the density.
Radiation