What is the relationship between density and floating or sinking in a fluid

What are transitions between a liquid and a solid called? identify which way they are transitioning

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?