Besides this, before long Nature would herself establish a barrier, by cementing with frost the blocks of ice accumulated between the two banks.

The excess snow compressed into ice, millennium after millennium, and the ice accumulated and advanced southward.

The great northern dunes of Vastitas Borealis were being rapidly inundated, as the truly enormous aquifers under Vastitas and the north polar region were being pumped onto the surface by drilling platforms that rose on the ice as the ice accumulated under them.

Huge winds bent the pines on the mountain's lower slopes nearly horizontal and pelting ice quickly accumulated in the thick branches, bending the trees lower.

It proved to be quite vulnerable to icing conditions, and was prone to fall into a spin with even small amounts of ice accumulated onto its Davis wing.

But when exposed to larger droplets, with flaps set just as they were over Roselawn, the ice accumulated behind the rubber boots in ridges, much as it had in the British tests six years earlier.