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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 ...
Earth’s 5 catastrophic mass extinctions, explained
Our planet’s first known mass extinction happened about 440 million years ago. Species diversity on Earth had been increasing ...
How many world oceans are there? If you said 4, you're wrong. Here's why
Historically, there have been four oceans: the Atlantic, Pacific, Indian, and Arctic. On Feb. 9, U.S. Secretary of the Interior Doug Burgum announced the Gulf of Mexico had officially been changed to ...
BBC8 个月
Oceans of the world
All five oceans are connected with each other ... Image caption, Image of the Earth from a satellite. The ocean floor can be flat or it can have caves and mountains. The weather can be very ...
Live Science2 天
The Earth's oceans used to be green — and could one day turn purple, scientists say
The changes in ocean chemistry were gradual. The Archaean period lasted 1.5 billion years. This is more than half of Earth's history. By comparison, the entire history of the rise and evolution of ...
Phys.org5 天
Earth's oceans once turned green—and they could change again
The changes in ocean chemistry were gradual. The Archean period lasted 1.5 billion years. This is more than half of Earth's history. By comparison, the entire history of the rise and evolution of ...
The Conversation6 天
Earth’s oceans once turned green – and they could change again
The changes in ocean chemistry were gradual. The Archaean period lasted 1.5 billion years. This is more than half of Earth’s history. By comparison, the entire history of the rise and evolution ...