Page 19 - Oceans

Titles:E.Explore_Ocean (ED594)
Titles:E.Explore_Ocean (ED594)
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AN OCEAN fLOOR mAP ≤ 1 017 000 18/04/07 1:30 NT1-6
The development of echo-sounding in the 1920s enabled ships to
record ocean depths easily and quickly. As the data built up, it started
to create a picture of the ocean floors. This was made a reality in the 1970s,
with the publication of the first world ocean floor map by American marine
geologist Bruce Heezen (1924–1977) and his research assistant Marie Tharp
(1920–2006), seen above. The map (right) was put together using simple depth figures,
so a lot of the detail was based on educated guesswork. But it was a vivid representation
of the ocean floors, and the patterns and features that it revealed inspired both its makers
and other scientists to discover more about how the oceans were formed.

ocean floors
≥ mORE REALISTIC HEIGHTS AND SLOPES
In reality, oceanic volcanoes are broad domes, and the gradients at the
edges of shallow coastal seas are so shallow that, if these gradients
were on land, you could ride a bicycle up them. Even deep ocean
trenches are broad troughs rather than steep-sided chasms. This Volcanic island as
it is in reality
illustration shows a more realistic view of the scene depicted opposite.