You might have heard the phrase ‘hot air rises”. Explain the role of a convection current in heating a cold room.

the answer is d

lies a supermassive black hole called sagittarius a*, or sgr a* for short.

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d