(CN) — More than a billion years ago, tectonic activity on Earth may have stopped so completely that no new mountains could be formed on the planet for an entire eon — putting evolution of life on ...

Earth's mantle temperatures during the Archean eon, which commenced some 4 billion years ago, were significantly higher than they are today. According to recent model calculations, the Archean crust ...

The biggest debate among experts on the Anthropocene is when, exactly, a geologic epoch marked by humanity's influence began. As an astrobiologist who studies major historical transitions in planetary ...

Earth's mantle temperatures during the Archean eon, which commenced some 4 billion years ago, were significantly higher than they are today. According to recent model calculations, the Archean crust ...

Model calculations indicate that the extreme density of the base of the thickened primary crust caused it to subside into the Earth's mantle Earth’s mantle temperatures during the Archean eon, which ...