Earth’s oceans weren’t always blue, scientists say
But while lifeless during that time, the planet was already covered by vast oceans dotted with hydrothermal vent systems that ...
National Geographic news5mon
Precambrian Time
About 800 million years ago, oxygen levels reached about 21 percent and began to breathe life into more complex organisms. The oxygen-rich ozone layer was also established, shielding the Earth's ...
BGR5y
A day on Earth was a half-hour shorter just 70 million years ago
A day on Earth was just 23.5 hours long, 70 million years ago. Researchers discovered this by studying the growth rings of ancient mollusk fossils. The findings could tell us more about or planet ...
ZME Science on MSN15d
The Solar System Passed Through a Massive Cosmic Wave Millions of Years Ago — And This May Have Cooled Earth
The Radcliffe Wave is a massive, undulating structure filled with dense clouds of gas and dust, stretching across several ...
Samaa TV2d
Early oceans were green, not blue: study
The earliest lifeforms, cyanobacteria, appeared around 4 billion years ago. These organisms, now known as algae, were among the first to engage in oxygenic photosynthesis.
PBS5mon
Birth of the Himalaya
Over two hundred fifty million years ago, India, Africa ... the collision of India with Asia we must first look beneath the Earth's surface. The continents are carried by the Earth's tectonic ...
Ars Technica1mon
Did the snowball Earth give complex life a boost?
Earth didn’t just go through one deep freeze ... located in present-day Scotland and Ireland. Formed about 800 million years ago on the eastern shore of a past continent called Laurentia ...