concentration

Global ozone concentrations have dropped over the last decade.

Then your ion concentrations go out of whack as well.

Methane forms in large concentration above wetlands, and as it turns out, the cultivation of certain grains creates vast areas of artificial wetlands, and probably drastically increases the amount of methane getting into the atmosphere, over and above what would be there.

Um, however, for the latest interglacial period, the one we are in now, this pattern did not hold, that is, the concentration of carbon dioxide and methane dipped a little bit after, uh, uh, after peaking at the beginning, near the beginning of the interglacial period, but then it began to rise again.

But uh, gradually as the concentration of greenhouse gases goes down, Earth starts to cool again, and eventually you slip back into an Ice Age.

Now, the typical pattern for an interglacial period, and we have studied several, is that the concentration of carbon dioxide and methane gas actually reaches it... its peak, that is, there is the most carbon dioxide and methane gas, uh, greenhouse gases in the atmosphere just after the beginning of the interglacial period.

From a plant’s evolutionary view point, however, it was also a land of opportunity, free of competitors and predators and full of carbon dioxide and sunlight (the raw materials for photosynthesis, which are present in far higher concentrations in air than in water).

At locations around the globe, geologists had found an unusually high concentration of iridium in the layer of sedimentary rocks that was formed about 65 million years ago.

Even though mean levels may mask much higher local concentrations, it is still the case that many deep-sea animals are exposed to conditions in which a normal filter-feeder would starve.

We lacked concentration and it cost us the goal and the game.

His concentration on civil rights has improved his popularity.

Well, are you intending to study film as your main concentration?

These should be the area of concentration for researchers to locate and protect those regions as a way to sustain coral reefs.

I am even thinking about doing a graduate degree with a concentration in that after I taught for a while.

There's been too much concentration of power in the hands of central authorities.

This has also led to a concentration of wealth in a small number of hands.

Saline soils, which have high concentrations of sodium chloride and other salts, limit plant growth, and research continues to focus on developing salt-tolerant varieties of agricultural crops.

Also, data from a later mission indicates significant concentrations of hydrogen and by inference water, less than a meter underground at both poles.

These peoples settled at first in scattered hunting-and-gathering bands, although in some places near lakes and rivers, people who fished, with a more secure food supply, lived in larger population concentrations.

So the unusually high concentration of Ir seems to require a special explanation.

Ir is found in high concentrations in some meteorites,in which the solar system’s original chemical composition is preserved.

How we’re able to keep from being distracted and what the conditions for good concentration are.

Concentrations of positively charged particles develop at the top and bottom of the cloud, but the middle region becomes negatively charged.

But what about the Spartinas, well, they allow a certain amount of salt to enter their cells, bringing the salt content of the water within the plant, to a slightly higher concentration than that of the surrounding seawater.

Um... so we are entering into uncharted territory now, in terms of the amount of carbon dioxide, the concentrations of carbon dioxide that are now being put into the atmosphere as a result of industrialization and the use of fossil fuels.

And then, for reasons which are not entirely clear, the concentration of greenhouse gases gradually goes down.

The most significant data have come from a concentration on three major questions.

There's no symmetry to its overall shape, no central concentration of galaxies, but it happens to have both elliptical and spiral galaxies within it.

An irregular cluster might appear to be lopsided, asymmetrical, with a little concentration of galaxies in the center.

And as for the bananas, researchers also found a high percentage of fossils from banana plants in sediment samples dating from about 7,000 years ago, proof the bananas were deliberately planted, because where bananas grow naturally the concentration of the plant fossils is lower.

Water temperature can fluctuate seasonally or even daily and changing level of rainfall can lead to fluctuations in the concentration of chemical in the water or even to period in which the aquatic habitat dries up.