scientist use sound
Scientists know the depth of the ocean by using technology like the Deep Worker or the "Alvin". It takes them to the bottom of the ocean so they can study ocean life. Also ships use sonar (SOund NAvigation and Ranging) to see what the depth of the ocean is.
Definitely each day scientist find more life down there. JASMYNELOVESFLOWERS
You use Sonar
The ocean.
To find out the ocean`s depth
A 30cm Ruler.
Deep Ocean Zones
You find them in any warm ocean,river mouth,or any warm waters.
Metres.
Lobsters will live in any ocean where they can find food. Lots of fish live in cold waters.
4590 Meter.
You're likely to find warm water currents near the equator.