when a substance is in the solid state it's __ are closely packed they ___ on my spot there are more check the picture:)

What provides structure to the human body?

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

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?