Thứ Tư, 28 tháng 2, 2018

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How many eggs a day should eat?

How Many Eggs Can You Eat Per Day on an Egg Diet this question is here in bangla.

For more infomation >> এক দিনে কয়টি ডিম খাওয়া উচিত? How many eggs a day should eat? - Duration: 1:35.

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How much water is in Earth's lakes? - Duration: 2:08.

Using high-resolution satellite imagery and a mathematical model, scientists have

estimated that the mean depth of lakes around the world is substantially lower

than previously thought. How many lakes are there and how deep are

they? These are fundamental questions in the study of lake water. With advances in

satellite imaging techniques, research over the last decade has narrowed in on

the first question estimating well over 100 million links on Earth. The question

of depth, however, has remained elusive. A complete understanding of these

parameters is critical to understanding the ecological and economic functions of

lakes, specifically their role in global carbon cycling.

A team of researchers working in Sweden and the USA set out to find an

accurate means to estimate the volume and depth of Earth's lakes. To accomplish

this, they developed and tested a mathematical model which incorporates

the Earth's topography and the surface area of 28 million lakes. The team then

tested their prediction method against a high confidence database of lakes in the

USA, Canada, and Sweden. The estimates, they found, corresponded quite well with the

survey data. Once verified, the researchers then used the mathematical

approach to calculate the Earth's overall lake volume and average depth.

Their estimates: a volume of nearly 200,000 cubic kilometers and a mean of

42 metres deep. These improved estimates of depth and volume represent a major

step forward in understanding the distribution of lake water on Earth. The

finding that lakes are significantly less deep on average than previously

thought has important implications for the role of these bodies of water in

global geochemical cycles.

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