Sentences with phrase «layer of soil»

«That ice is still there,» he says, beneath a thin layer of soil.

These fires burn for days or weeks under the top layer of soil, releasing smoke and heat through the soil and vegetation.

Ensure you put a generous layer of soil in the base to get you started.

The biggest difference came from aluminum in the top organic layer of soil, with concentrations declining at 14 locations by an average of 40 %.

When the orbit was most circular, things dried up, leaving lighter layers of soil exposed to the air.

Without foliage and natural layers of soil, the land is rendered unable to retain water.

Cover the seeds with a thin layer of soil and spray the surface with clean, filtered water.

Scientists took samples from the top organic layer of soil and the underlying mineral layer.

A green roof can be intensive, with thicker soils that support a wide variety of plants, or extensive, covered in only a light layer of soil and minimal vegetation.

Their systems are elaborate, with layers of soil, clay, sand, gravel and matting to protect the plastic from puncture, and sumps, pumps and wells to monitor and draw off any water that penetrates the system.

Intensive: a thick layer of soil with a variety of grasses, herbs, flowers and shrubs; these require a lot of care

In one study in South Dakota, placement of nitrogen fertilizer in the surface layer of soil led to higher emissions of nitrous oxde from zero till compared to convention till.

Some 115 million years ago, when it was much colder here than it is today, mud pushed down into the permafrost layers of soil below, forming these blotches.

Authorities dealt with the problem after the 1986 Chernobyl nuclear disaster by turning over a deep layer of soil to bury the radioactive dust.

Permafrost — a vast, frozen subsurface layer of soil — covers nearly a quarter of the land in the northern hemisphere.

They discovered several artifacts from what appears to be an ancient village, including carved wooden tools and bits of charcoal, in a thin horizontal layer of soil, called paleosol.

«But when we began to remove the initial layers of the soil, we started to find thousands and thousands of objects from the imperial and colonial period,» he says.

Osmanagich, who says he has several degrees in economics and political science but lacks formal training as an archaeologist, concluded that this pyramid was so old it had become obscured by layers of soil and vegetation that had accumulated since the last Ice Age, 12,000 years ago.

Although forks can not hold on to soil as well as plants do, they do help hold it together and ward off larger layers of soil sliding down.

Thick layers of soil sitting on limbs harbor animal and plant life that is unknown to science.

Archeology in Katmai is both an art and a science: puzzling over layers of soil to tell stories about the people who once lived here.

The rounded, crater - like shapes, unusual for Frankenthaler, contribute to a sense of depth, like tunnels through underground layers of soil and stone.

Guillaume Bijl mocks up an archaeological site 25 feet square and 18 feet deep, whose steep walls imitate layers of soil.

I'd dig a hole deep into the earth and when (years later) I scraped away the final layers of soil, the floor of my pit would reveal the truth.

Carbon stored in trees as well as the upper layers of soil is released back into the atmosphere during a fire.

Pre-vegetated modules are transported to the job site with removable edging; once the modules are fitted together, the edging is removed to create a continuous layer of soil.

The icy deposits appear to be patchy and thin, and it's possible that they are mixed in with the surface layer of soil, dust and small rocks called the regolith.

They removed about 60 centimeters of top soil from part of each plot and spread a 1 - centimeter - thick layer of soil in others.

Hypothermia (Back to Top) Wild hamsters live in burrows that are insulated with thick layers of soil and rock that protect them from excessive heat and cold.

SOILSIM, has been adapted for use in crop models by inserting comments in the code, preparing a dictionary of variable and parameter names and units, stripping our code dealing with the deeper layers of the soil, and replacing the empirical boundary - condition equations with equations that link to the crop model.

There are fears that Arctic warming will worsen wildfires that, in turn, burn through subsurface layers of soil and hasten the thawing of permafrost beneath.

Golombek helped SpaceX whittle its list to a handful of sites, including Arcadia Planitia and Deuteronilus Mensae, which show signs of having pure water ice buried beneath a thin layer of soil.

active layer the top layer of soil in permafrost that is subjected to seasonal freezing and thawing

As temperatures rise, nutrient - rich permafrost — a frozen layer of soil — thaws, releasing nutrients into ponds and enhancing plant growth.

The edges of the plastic film should be sealed with a layer of soil to prevent heat loss and to retain moisture.

Landfills are solid waste disposal sites, where both active and inert waste is deposited and compacted, and then periodically covered over with a layer of soil.

Spirit has indeed been stuck in the same place since early May, but wind cleared off its solar arrays, and it has plenty of juice; so it has been using it's various tools to analyze the layers of soil that it's busted wheel has skewered up.

Scientists believe that these ions, which the SELENE spacecraft (better known as Kaguya) detected, drifted over geologic time from the outer layers of Earth's atmosphere and became embedded in the moon's regolith, a loose top layer of soil and rock.

A team led by scientists at Lawrence Berkeley National Laboratory found that the type of plant inputs (that is, root or needle litter) affected total carbon and nitrogen retention over 10 years, but that soil horizon (essentially, the layer of soil, such as the topsoil organic or deeper mineral layers) affected how the litter - derived soil organic material is stabilized in the long term.

The layer of soil should be at least six centimeters deep.

In addition, permafrost — a layer of soil below the surface that remains frozen throughout the year — could thaw, adding additional nitrogen to the ecosystem.

By sandwiching the bacteria between two layers of the soil they were found in, separated by a semi-permeable membrane, they were able to drastically increase the chances of a bacteria growing — and producing antibiotics — in the lab.

Like many artificial islands in Tokyo Bay, Jakushu is built out of thousands of tonnes of household waste sandwiched between layers of soil.

Researchers can also look at the layers of soil and rock in which objects are found - if these layers were not disturbed over the years, then objects in the same layer should be the same age.

On March 21, 2012, the MESSENGER team also revealed new supporting evidence that many permanently shadowed craters in Mercury's polar regions may harbor water ice insulated with a thin layer of soil or dust, or some other radar - reflecting volatile substance such as sulfur.

Once the bulbs are arranged in the container add another layer of soil to secure them in place and to ensure their roots stay moist as they bloom.

The second passage covers the layers of soil: topsoil, s