Approximately how old is the moon thought to be?
a. 1 billion years
b. 2.1 million years
c. 3.8 billion years
d. 4.5 billion years

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?

Asolid that forms and separates from a liquid mixture is called

What volume would 2.25 moles of ne has occupy at stp?