answersLogoWhite

0


Best Answer

In the earlier of Earth's years; the Hadean from memory; there was no water and hence no hydro- anything. This was the first 700 million years or so. (Between 4.5 and 3.8 billion years ago.)

But some very old banded iron deposits come from this early, indicating that these were precipitated by changing chemical conditions.

Another few hundred million years later, the blue-green algae appeared, and having invented photosynthesis with its attendant release of oxygen, created the large banded iron deposits. And some soft-bodied fossils, such as the Ediacaran.

User Avatar

Wiki User

11y ago
This answer is:
User Avatar
User Avatar

Anonymous

Lvl 1
3y ago
This is a very poor answer. Time scale is all wrong and the planet was covered in shallow ocean by four billion years ago from the late heavy bombardment that ended about 3.9 billion years ago. 

Add your answer:

Earn +20 pts
Q: What did hydrothermal vents do during Earths first years?
Write your answer...
Submit
Still have questions?
magnify glass
imp