| 1 | In convection, hot currents flow upwards. | |
| 2 | The machine circulated hot air by convection. | |
| 3 | Basically, [in both] you have the benefit of natural forces such as convection. | |
| 4 | Deep convective clouds play a role in regulating the Earth's temperature. | |
| 5 | They also suspect a fluid outer core generates the planet's magnetic field though convection. |
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