How can we be so sure that the Marianas Trench is the deepest place on Earth when much of the ocean hasn’t been explored yet?
In: Geology
We have mapped everything, we just haven’t done it in detail…
So we have undertaken large scale mapping of the entire ocean using technology like sonar – this is like flying over a mountain range and doing an aerial survey. This lets us see a lot of the big details like finding where the biggest mountains are, spotting the big valleys, and noting things like ‘that bit is a forest’.
What we have not done is the detailed mapping – this would be like sending down a team of climbers to map out all the small hills, rivers and paths, and do things like surveying all the plants and animals that you can’t see clearly in the big scale surveys.
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