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elevation vs altitude
In the airline industry elevation = height above ground and altitude = height above sea level. Altitude is used to calculate air pressure, elevation is used to make sure you don't crash into mountains.
What is the difference between “it's up to you” and “it's down to you”?
ErikE: I personally would say "because of you" for number 4. It is an example of where "Down to you" is valid and "Up to you" is not, and I have heard this expression used in this way many times.