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An international research team has successfully drilled and retrieved a 9,186-foot-long (2,800-meter-long) ice core from Antarctica that dates back 1.2 million years.
Ice core sample taken from drill. An ice core is a core sample that is typically removed from an ice sheet or a high mountain glacier.Since the ice forms from the incremental buildup of annual layers of snow, lower layers are older than upper ones, and an ice core contains ice formed over a range of years.
A team retrieved a 9,186-foot-long (2,800-meter) ice core from Antarctica that's nearly as long as 25 soccer fields end-to-end. - PNRA/IPEV A research team has collected what may be among the ...
Also, the stadium includes a 10 feet (3.0 m) high by 450 feet (140 m) wide ribbon video board along the top of the bleachers in the north endzone, which adds another 4,500 square feet (420 m 2) to make a grand total of 13,219.5 square feet (1,228.13 m 2).
Their machinery could drill through 15–20 feet (4.6–6.1 m) of ice in 40–50 minutes. From 1300 to 3,000 feet (910 m) in depth, core samples were 4 + 1 ⁄ 4 inches (110 mm) in diameter and 10 to 20 feet (6.1 m) long. Deeper samples of 15 to 20 feet (6.1 m) long were not uncommon.
During the Last Glacial Maximum, much of the world was cold, dry, and inhospitable, with frequent storms and a dust-laden atmosphere. The dustiness of the atmosphere is a prominent feature in ice cores; dust levels were as much as 20 to 25 times greater than they are in the present.
This is a list of ice cores drilled for scientific purposes. Note that many of these locations are on moving ice sheets, and the latitude and longitude given is as of the date of drilling. Note that many of these locations are on moving ice sheets, and the latitude and longitude given is as of the date of drilling.
The coverage difficulty is dealt with by acknowledging it and by using other proxies (e.g. ice cores, corals) in difficult areas. In some cases it can be shown that the parameter of interest (temperature, precipitation, etc.) varies similarly from area to area, for example by looking at patterns in the instrumental record.