The sun hadn't been up long enough to create thermals from heated rocks on the ground.

He glanced at the earthenware kettle which, on its bed of heated rocks, had nearly come to the boil.

This is an Ojibway term describing the practice of boiling food by dropping heated rocks into water.

Here the trail became exceedingly difficult, for she had passed over shuddering, heated rock in her effort to shake the pursuit.

Their guest house is a tepee with heated rocks for warmth.

Failing to attract Daryl's attention, he closed the door, took a pitcher and poured more water on the heated rocks.

All he knew was that he felt warm, but the warmth wasn't just from the heated rocks.

Fragmentation of the heated rock was increased by throwing water on to it.

They run the hydrogen past heated oxygen-bearing rock to get water vapor.

As time passes, the heated rocks cool and their density increases.