about 6 cm by 10cm
yes.
That depends on how big it is.
Enough room that you can see them
It won't, Magnesium won't blow up.
one hundred wind turbines take up one kilometre of land
about half a a humans normal room
Titanic was 882 ft. long.
Yes, apps take up memory and space on your iPod.
A Bose Subwoofer does not take up too much room. The average size of a Bose Subwoofer is about 6 inches by 9 inches. However, there is another model that is 8 inches round.
. THATS THE REASON WHY I TYPED THIS UP REEEEEEEEEEEEEE
Air does indeed take up room. Air molecules have a mass that takes up whatever room it is confined to.
It depends on the size of the cage. They will take a bit of space but not so much that you will get annoyed with it. Maybe about half/a quarter of a room or so.