Misc: A sea wasp can kill a human in less than a minute, what kind of creature is it?

Questions

Definitions The weight at the end of a pendulum is a(n) ?

Definitions The wide wall built along the banks of rivers to stop flooding is a(n) ?

Definitions The word "cumulus" refers to a type of ?

Definitions This instrument is used for measuring the distance between two points, on a curved surface.?

Definitions This instrument measures atmospheric pressure.?