Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> What is a submarine? How can it be made to divein water and come to surface iof water?

Answer 1

Submarine is a water - tight boat which can travel under water like a ship .It is providgd with water tanks . when submarine is to dive , water is filled in water tanks density of sea water tanks are emptied and average density . of submarine become less than the density of sea water and it rises to surface of water .

While submarine is underwater soldiers can see the enemy activities though periscope.