No
No
Convection takes place because cool air is less dense than warm air.
No, fermentation takes place in any place or situation but in vacuum condition fermentation takes place in very slow pace
Convection takes place in the Earth's mantle, which is the layer of hot, semi-solid rock located between the crust and the outer core. Heat from the Earth's core drives convection currents in the mantle, causing the movement of tectonic plates.
Conduction and convection require the presence of a medium (such as air or water) for the transfer of heat. In a vacuum, there is no medium to transfer heat, so conduction and convection cannot occur. Heat in a vacuum can only be transferred through radiation.
Mode of energy transfer in fluids is convection.
Convection
The two layers below Earth's surface where convection takes place are the mantle and the outer core. In the mantle, convection currents are responsible for plate tectonics and the movement of Earth's lithosphere. In the outer core, convection currents drive the movement of molten iron that generates Earth's magnetic field.
Conduction and convection cannot occur in a vacuum because they both rely on the movement of matter to transfer heat. In a vacuum, there is no medium for heat to be transferred through conduction or convection. Radiation is the primary mode of heat transfer in a vacuum.
Thermal transfer by convection takes place in materials that are fluids or gases. In this process, heat is transferred through the movement of the material itself, creating a circulation pattern that transfers heat energy. Convection is a key mechanism for heat transfer in liquids and gases.
The Sun's fusion takes place in the core. The Convective zone brings heat to the surface by thermal convection, which is basically hot plasma coming up to the surface, then cooling and sinking.
Conduction needs a conducting medium. Convection needs something to convect. Neither exists in a vacuum.