Oceans

What did early ocean scientists use to measure the distance to the ocean floor?

More Questions from Oceans
How many engines did the Titanic have?
Reveal Answer
Which reef would you find in the Gulf of Mexico?
Reveal Answer
Which two oceans surround North America?
Reveal Answer
Which of these is the largest of the world's oceans?
Reveal Answer
What does a shark's liver contain a lot of?
Reveal Answer
What causes deep ocean currents?
Reveal Answer
What was the goal of Project Mohole?
Reveal Answer
The longest river in Europe flows into what sea?
Reveal Answer