نمک ممکن است 700 میلیون سال پیش به تبدیل زمین به دنیای یخ زده کمک کرده باشد

Salt may have helped turn Earth into a frozen world 700 million years ago

Earth may have been pushed deeper into a global deep freeze by something surprisingly ordinary: salt. Around 700 million years ago, Earth entered periods of extreme glaciation known as Snowball Earth, when ice is thought to have spread across much or potentially all of the planet's surface. Scientists have long known that expanding ice could have helped drive this transition: As bright ice replaces darker ocean…