a warship that can operate both on and under water
a type of small vehicle that is used to travel on water
beneath the surface of a body of water
to visit places one has never seen before
the great mass of salt water that covers most of the earth's surface
the armed forces of a country
a flat part of a bicycle or machine that is pushed with the foot to make it move or operate. It is typically circular and part of the mechanism that drives motion
a machine that uses steam made from boiling water to produce power and make parts move
a state of armed fighting between two or more groups, nations, or states
the war that took place from the year 1914 to 1918 between the allies and the central powers
the war that took place from the year 1939 to 1945 between the axis and the allies
to act violently against someone or something to try to harm them
a country or its forces that one is fighting against in a war
a device that produces electricity; may have several primary or secondary cells arranged in parallel or series
newly developed and incorporating new, modern methods or technology
a type of energy generated by splitting atoms to release their stored energy
to prevent someone or something from being damaged or harmed
someone whose job or education is about science
the earth's surface where it is not under water
to keep something in a particular place for later use, typically in a systematic or organized manner
