Does crumpled paper and a flat sheet of paper have the same weight

How are elements arranged in a periodic table

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

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?