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The first emergence and persistence of continental crust on Earth during the Archaean (4 billion to 2.5 billion years ago) has important implications for plate tectonics, ocean chemistry and biological evolution. This happened about a half-billion years earlier than previously thought, according to new research being presented at the EGU General Assembly 2021.Once land becomes established through dynamic processes like plate tectonics, it begins to weather and add crucial minerals and nutrients to the ocean. A record of these nutrients is preserved in the ancient rock record. Previous research used strontium isotopes in marine carbonates, but these rocks are usually...

Greenstone launches all-women radio talk network By Gertrude Chavez-Dreyfuss NEW YORK (Reuters) - Greenstone Media, a radio company whose founders include social activist Gloria Steinem and actress Jane Fonda, has launched an all-women, all-talk network across the United States. Steinem said the network, which is run by women, aims to provide an alternative to current radio talk, which she describes as "very argumentative, quite hostile, and very much male-dominated." This network "has a different spirit. It has more community. It's more about information, about humor, about respect for different points of view and not constant arguing," Steinem told Reuters in...