Tuesday , November 30 2021

Tag Archives: earth’s

Meteorite bombardment likely to have created the Earth’s oldest rocks

Scientists have found that 4.02-billion-year-old silica-rich felsic rocks from the Acasta River, Canada — the oldest rock formation known on Earth — probably formed at high temperatures and at a surprisingly shallow depth of the planet’s nascent crust. The high temperatures needed to melt the shallow crust were likely caused ... Read More »

Iron-silica particles unlock part of the mystery of Earth’s oxygenation

The oxygenation of Earth’s atmosphere was thanks, in part, to iron and silica particles in ancient seawater, according to a new study by geomicrobiologists at the University of Alberta. But these results solve only part of this ancient mystery. Early organisms called cyanobacteria produced oxygen through oxygenic photosynthesis, resulting in ... Read More »