Questions

It will stop at a height where the weight of the balloon with contents is equal to the weight of air displaced by it, i.e , when the upthrust is equal to the downthrust. The question of bursting will depend on how much difference of pressure inside and outside , the material of the balloon can withstand. It is assumed the balloon is filled with a lighter than air gas like hydrogen or helium.

Budapest is the capital of Hungary

Lagoons are formed along the coasts by the action of winds and waves. They are commonly found off the deltas of large rivers such as the Nile and Ganges.

The sheet number on the map is found in bold print in both the upper right and lower left areas of the margin.