Oxygen began entering Earth's oceans around 2.32 billion years ago, and shallow seas followed within a few million years.

For roughly 2 billion years of Earth's early history, the atmosphere contained no oxygen, the essential ingredient required for complex life. Oxygen began building up during the period known as the ...

This is how our planet rescued itself from extreme conditions in the Cretaceous Period. This is the story of how our planet rescued itself from extreme conditions in the Cretaceous Period, at the cost ...

You are taught early in science that oxygen on Earth comes from sunlight. Plants, algae, and cyanobacteria use light to split ...

A large research synthesis, published in one of the world's most influential scientific journals, has detected a decline in the amount of dissolved oxygen in oceans around the world - a long-predicted ...

RIVERSIDE, Calif. – A deficiency of oxygen and the heavy metal molybdenum in the ancient deep ocean may have delayed the evolution of animal life on Earth by nearly two billion years, a study led by ...

Oxygenation in the tropical North Pacific Ocean increased during a warm climatic interval that occurred roughly 56 million years ago, despite high global temperatures, according to a new study. Its ...

Rivers are getting hotter and losing oxygen, with 70 percent of rivers becoming oxygen-deprived and more getting warmer. This process, due to the effects of climate change, is occurring in rivers much ...