#Earth’s Oldest Water May Have Come from Ancient #H2O-Filled Dust!

Earth’s Oldest Water May Have Come from Ancient H2O-Filled Dust ~ Mindy Weisberger, Senior Writer   |   LIVE SCIENCE, November 12, 2015.

Earth is the only planet in the solar system that boasts a surfaceabundantly covered with liquid water. But where that water came from is a long-standing question that scientists are still unraveling.

A new study reports the first evidence that ancient dust saturated with water collected at the heart of an infant Earth.

Around 4.6 billion years ago, Earth formed from countless collisions of dust and rocks around the sun. Planetary scientists at the University of Hawaii questioned whether some of the ancient minerals lurking in the deep mantle — 1,800 miles (2,900 kilometers) below Earth’s surface — might have held the planet’s first water molecules. And lava sampled in 1985 from Baffin Island in the Canadian Arctic originated from just the right depth to provide answers. [Photo Timeline: How the Earth Formed]

An eruption at Iceland’s Holuhraun lava field, fed directly from the Iceland mantle plume. Plume water from Baffin Island that was measured for the study was trapped inside rocks.
Credit: Magnús Tumi Guðmundsson

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