Volcanic Ash

This is a volcanic ridge.

It is a volcanic planet.

The volcanic eruption threatened the village.

Japan is made up of volcanic islands.

After the volcanic eruption, this species declined.

These are volcanic stones laid by hand.

No life without tectonic activity, without volcanic activity.

IF, as scientists suspect, Europa has volcanic activity.

The surface of the earth rose due to the volcanic activity.

This is closely related to tectonic and volcanic activity of planets.

And we knew it was volcanic back in the '60s, '70s.

looking at the volcanic features running along that entire 42,000 miles.

In the southern hemisphere there are impact craters, there are volcanic craters.

The planet's surface was bombarded by comets, and ravaged by volcanic eruptions.

The only abrupt worldwide change would have been major asteroid impacts or volcanic super eruptions.

When we first found it, we thought it might be an outcrop of magnetic rock but all the geological evidence was against it.

Late heavy bombardment Volcanic steam rose up, forming clouds, then returned as liquid water and formed oceans.

There's a sort of gaping volcanic hole at the top. Whatever will we do to fix this.

And that's Mount Olympus on Mars, which is a kind of huge volcanic shield on that planet.

Yes, because they had a volcanic eruption and now most of Fiji is three feet below sea level!

So, that gives you an idea of the tectonic events or volcanic events which have happened on that planet.

He looked at the odds of another world war, of a massive volcanic eruption, even of an asteroid hitting the Earth.

In a desert plain in Tanzania, in the shadow of the volcano Ol Doinyo Lengai, there's a dune made of volcanic ash.

And then there's earthquakes, and then volcanic eruptions, on the order of one every five years, that completely wipes the area out.

Not only is it coming out of the Earth so, biogenesis made from volcanic activity but that bacteria supports these colonies of life.

We find microbial life in every part of the planet in ice, in coal, in rocks, in volcanic vents it's an amazing thing.

And what you're seeing here is a cloud of densely packed, hydrogen sulfide rich water coming out of a volcanic axis on the sea floor.

In Japan, some suggest the solidification of the bay was due to underwater volcanic activity although no such activity has been reported in the area.

looking for gases of volcanic origin, studying the surface, studying the magnetism on the surface, which we don't understand, as well as about a dozen other areas.

It turns out that there were about nine different environmental factors some, rather subtle ones that were working against the Easter Islanders, and they involve fallout of volcanic tephra,

All this stuff is happening along that 40,000 mile long mountain range that we're calling the ribbon of life, because just even today, as we speak, there's life being generated there from volcanic activity.

Descendants of the ancient Tairona civilization which once carpeted the Caribbean coastal plain of Colombia, in the wake of the conquest, these people retreated into an isolated volcanic massif that soars above the Caribbean coastal plain.

I think that's one of the greatest stories right now that we're seeing from the bottom of the sea, is that the first thing we see coming out of the sea floor after a volcanic eruption is bacteria.

So here, you've got this valley with this incredible alien landscape of pillars and hot springs and volcanic eruptions and earthquakes, inhabited by these very strange animals that live only on chemical energy coming out of the ground.

And they are the descendants of the ancient Tairona civilization, the greatest goldsmiths of South America, who in the wake of the conquest, retreated into this isolated volcanic massif that soars to 20,000 feet above the Caribbean coastal plain.

There is tremendous amounts of hydrogen sulfide coming into this cave from volcanic sources and from the breakdown of evaporite minerals below the carbonates in which this cave is formed and it is a completely hostile environment for us.

Well, even in basalt surfaces in lava tube caves, which are a by product of volcanic activity, we find these walls totally covered, in many cases, by these beautiful, glistening silver walls, or shiny pink or shiny red or shiny gold.

All along it was thought to be either an act of God or perhaps long, slow climate change, and that really changed in 1980, in this rocky outcrop near Gubbio, where Walter Alvarez, trying to figure out what was the time difference between these white rocks, which held creatures of the Cretaceous period, and the pink rocks above, which held Tertiary fossils.