Limestone pie and hot melted silver.

But after some nagging, I got him to do that.

It looks beautiful.

We're not killing the colony we're taking a small core sample out of the top.

Well, we have to take a little excursion, and we'll start in central Texas.

The first tunnels date back to 60 B.C.

Maybe they could extract carbon dioxide.

They shouldn't be there. And we called it Lost City.

I collect soil samples.

The dip slopes in the overlying limestone, the orientation of the flora, shallow waters...

It's about 400 million years old.

And then they are fossilized over millions of years.

Plants are nourished by earth.

Over on the eastern side it's gentle, as you can see.

which is going to cause air pollution, water pollution,

The town had a vermiculite mine in it.

To change the community you have to change the composition of the soil.

Latin'calx 'for'lime'

Should aluminum be in the soil and the rain?

The soil retained richness.

But what are the conditions that make it possible?

According to the Roman scholar Pliny the Elder, citizens of the Empire believed that limestone from a quarry near Troy would dissolve flesh.

We are after all organic creatures, and the culture of the school is absolutely essential.

I picked this up at MlT. It's a little younger.

We're in Pole Canyon, looking west up the western escarpment of Mount Washington, which is 11,600 feet on top.

The dead have been covered with lime.

Worms are sometimes beneficial to soil.

Plants take in water from the soil.

Water resources are running low.

I said, What can you build in this place?

That soil is rich in humus.

And this is the concept for the top of the city.

Acid soil is neutralised by ash.

The rain washed away the soil.

And these are not esoteric limits.

curiosity without assumptions.

Each point is a different species or a different stream or a different soil type.

Large scale use of pesticides and fertilizers raised concerns of soil pollution.

You can't get a tree to grow on bad soil.

There are huge walls buried under limestone plateau in the northeast of the Great Pyramid of Khufu.

She gets the women to plant new trees and water them, drop by drop.

Rich soil yields good crops.

Abiotic stress is the drought.

You are watching something, the spin, that is older than dirt, that's older than rocks, that's older than the Earth itself.

It's a very rocky soil, isn't it?