In mid-December 1916, frost started, making it possible to navigate through the frozen bog and to force the German fortifications.

More carbon dioxide would also be released as warmer temperatures speeded the decay of organic matter, he said, and more methane would be released as frozen bogs in the north began to thaw.

The sport was invented in the 16th century by Scottish farmers who curled on frozen bogs using smooth stones found in channels.

He drew a frozen bog, an unearthly grid.

In winter, when the whole wetland is frozen, snowshoe and sledge tours are being organised over the frozen bogs and in the case of snow also cross-country skiing trips.

The Harpers snowfields of frozen bogs, but no sign of a village.

Seizing his arm, she shoved him toward Vil and then started across the frozen bog.

-Serena Butler, Observations Each of the big black constructors out on the frozen bog had a pair of human operators who sat side by side in high cages at the controls.

It was dark again by the time we crawled out of our den and struck out across the snowy dunes toward the frozen bog to the east.

A frozen bog in Finland is the perfect place to film the acrobatic fights of black grouse.