Sentences with phrase «layered ice deposits»

The air has been sealed off in the bubbles when the ice was laid down, and extracted from cores drilled deep within the layered ice deposits.

Not exact matches

These ice deposits would likely require a thin insulating blanket, perhaps a layer of fine - grained surface material, or regolith, to keep it from sublimating away.

Then the researchers used an electron beam to carve away two squares of ice, exposing the tops of some nanotubes, and deposited a layer of palladium on top of this ice mask.

The deposits are exposed in cross section as relatively pure water ice, capped by a layer one to two yards (or meters) thick of ice - cemented rock and dust.

Dundas and co-authors say that banding and color variations apparent in some of the scarps suggest layers «possibly deposited with changes in the proportion of ice and dust under varying climate conditions.»

That base layer can warp and lift the ice above it, which is formed by snow deposited on the ice sheet's surface.

As wind and rain erode the mountain range, massive rivers carry more than a billion tons of sediment into the Bay of Bengal each year; in some places, the layer deposited since the most recent ice age is more than one kilometer thick.

In fact, Natural Resources Canada has a collection of ice cores that contain layers deposited up to 8,000 years ago — a time when the earth was far warmer than today.

«Some of the observed features included ancient river beds, craters, massive extinct volcanoes, canyons, layered polar deposits, evidence of wind - driven deposition and erosion of sediments, weather fronts, ice clouds, localized dust storms, morning fogs and more,» NASA wrote in a summary of the mission.

Also mentioned in the NASA release is the work of Kaitlin Keegan, a doctoral student at Dartmouth College whose focus is «firn,» the newly deposited layers of snow cloaking the two - mile - thick ice sheet that will, over time, become the next dense layers in the great frozen mass.

Here's another statistic: If the CO2 in the atmosphere were to freeze out as dry ice depositing on the ground, the dry ice layer would only be about 7 millimeters thick.

First we have an example of caribou dung preserved between ice layers, and hence necessarily deposited on ice.

The scientists were particularly interested in crystals found in layers deposited during the «Little Ice Age,» approximately 300 to 500 years ago, and during the «Medieval Warm Period,» approximately 500 to 1,000 years ago.

This means that depending on how thick the last deposit of firn was, on recrystallisation to ice, it could have transformed itself into many thinner layers separated by the particulate layers.

They plan to drill short ice core samples and analyze the past role of black carbon, including layers from 2012 (though Doherty points out that it may be difficult to tell how much black carbon was deposited then, rather than deposited in earlier years and concentrated by the melting).

The layers are matched to calendar years using the telltale deposits of known volcanic eruptions; and 3) connecting the ages of the ice and the air — i.e., the time difference between snow falling and air bubbles getting enclosed — is a problem all of its own.