Word: icing
(lookup in dictionary)
(lookup stats)
Dates: during 1960-1969
Sort By: most recent first
(reverse)
below the surface of the Greenland ice sheet by an Army team that had drilled to a record depth...
...retrieve ancient ice, Army engi neers, led by Physicist B. Lyle Hansen, used a thermal drill with a hollow, elec trically heated head that melted its way down through the sheet, while leaving a 51-in. ice core intact inside it. Every 5 ft. the drill was stopped so that the core could be returned to the surface for study...
...Army's Cold Regions Re search and Engineering Laboratory at Hanover, N.H., Geologist Chester Lang-way Jr. has been dating the ice cores both by counting the yearly layers -much as the age of a tree is determined by counting its rings - and by isotope dating of bubbles of ancient air trapped when the ice was formed. Samples tak en from the bottom of the sheet have been found to be as much as 10,000 years old. The ice and the trapped air bubbles are also being analyzed for composition, organic and inorganic im purities, influences of climate...
...reasons that they do not under stand, the amount of cosmic dust that falls on the earth - now about 2,000 tons daily - has trebled in the past 750 years. They have discovered that ice and snow accumulations during the Viking age (9th and 10th centuries) vary little from the present and that 1776 was an unusually warm year...
They also found that the temperature at the bottom of the ice sheet was a cozy 9°F. - much warmer than the - 13°F. surface temperature because of heat flow from the earth's interior...