Sentences with phrase «occurs over a period of hours»

Another recent study, by scientists from the U.K., Hawaii and Massachusetts, concluded that «marine and freshwater assemblages have always experienced variable pH conditions,» and that «in many freshwater lakes, pH changes that are orders of magnitude greater than those projected for the 22nd - century oceans can occur over periods of hours.

Not exact matches

Many Facebook experts recommend this «get to know you» phase to occur in 24 hours or less, but we've seen it work for that period of time as well as over an entire week.
Stroke What it is: Most strokes occur when a blood clot blocks an artery or a blood vessel, interrupting blood flow to an area of the brain over a period of minutes or hours, causing brain cells to die.
Acute inflammation occurs over seconds, minutes, hours, and days; for example swelling after an injury; while chronic inflammation occurs over long periods of time and is associated with chronic diseases such as diabetes, heart disease and obesity.
Rather, the events displayed in Darkest Hour occur over the span of the two - and - a-half week period between Churchill's appointment to the position and the events of the successful civilian - manned evacuation at Dunkirk.
The measurements should be taken during school hours over a suitable time period to be able to quantify the representative sound pressure level, likely to occur during teaching hours and should include noisy events — such as peak time road traffic, but should exclude rare, intermittent events, such as the mowing of school lawns.
After strict «chill out» time of 24 - 36 hours during which the cat is not handled, evaluation should then occur daily over the following 3 — 4 days for the 5 - day holding period
In general, the majority of all precipitation occurs as isolated 1 - day events, while most extreme precipitation occurs over a period of several hours embedded within 2 - 5 day events.
So whilst most of the radiation losses (over land) within the atmospheric windows will occur during the period between mid morning and early evening, radiation at wavelengths around the absorption peaks will be pretty constant during any given 24 hours.
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