There is the apple's weight (mass * gravity) but there is also the air resistance acting against the object's weight.
The kind of pollution comes from track able sources is usually trash pollution in the water. Air pollution and fossil fuel pollution are also track able sources.
they had air planes...
As far as I know there is no way for Air Drop to know WHAT it is transferring other then it's a file. All "Air Drop" is is just a "local" file transfer system similar to "File Sharing" only with out all the hoops you have to go through normally.
let the air out
There is 75% of air in the apple.thats why the apple is heavy. which means that only 25% is apple.
The percentage of an apple which is air is estimated to be 25%. This is the reason why n apple will float easily.
The sudden drop in air temperature is a stimulus.
apple macbook air
Air Drop Sentry Gun Emergency Air Drop
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The sudden drop in air temperature is a stimulus.