hydrothermal

There are also hydrothermal vents across all of the oceans.

Other than hydrothermal vents, what natural heat sources are you thinking of?

Bacteria that live on nutrients emitted from deep sea hydrothermal vents do not use solar energy.

I wonder if an advanced aquatic species could/would make use of hydrothermal vents to harness the some of the transformative properties of fire.

Actually, the reason iron is so cheap is because life chemistry and tectonic-hydrothermal processes have concentrated it.

This would likely cause quite a bit of volcanic activity under the surface and possibly create deep underwater vents. There is an analogue on earth in the deep ocean and the so-called hydrothermal vents. There are ecosystems down there that exist without energy from the sun.

Next to major energy sources like the sun, and even smaller ones like hydrothermal vents and streams of warmer water entering it, your puny server submarine is not going to be noticed.

"Also, concentrated uranium deposits are probably less common [on Mars] than on Earth because they depend on sedimentary and hydrothermal processes which are much more prevalent on Earth.

Closed cells could appear only after having a more complex metabolism and various kinds of ionic pumps, while the earlier membranes closing mineral pores could passively exploit the ionic fluxes of the hydrothermal vents.

There was a relatively short window for that to happen since uranium is soluble in water only in the presence of oxygen, and significant uranium deposits develop through hydrothermal processes.

We know that it's possible for food chains supporting even complex multi-cellular life to be founded on chemosynthetic organisms subsisting on hydrothermal sulfide emissions or serpentinization reactions.

At some point, but probably later than achieving replication, they might have had the form of membranes closing pores of minerals in hydrothermal vents, before the membranes became able to close, forming cells with an interior separated from the exterior.

I'm more partial to the idea that a metabolic system to harness energy had to develop before replication and that life started in alkaline hydrothermal vents rather than ponds due to the delivery of energy and concentration of chemicals.

Reporter Helen Fields wrote:>It’s the complexity of the hydrothermal vent environment—gushing hot water mixing with cold water near rocks, and ore deposits providing hard surfaces where newly formed amino acids could congregate—that makes it such a good candidate as a cradle of life.