Phytoplancton produces oxygen in the ocean

How do Oceans Produce Oxygen?

The ocean is a vast and vital source of oxygen for our planet. Every day, billions of tiny ocean plants called phytoplankton produce half of the world’s oxygen supply. Phytoplankton is microscopic, single-celled plants that drift in the sea. They are at the very base of the ocean food chain. Phytoplankton needs sunlight to grow, …

Water and Earth

Origin of Water: Where did Earth’s water come from?

Most of Earth’s water is in the oceans. But where did Earth’s water come from? Some of it came from inside the planet. When Earth formed 4.6 billion years ago, it was a hot, molten blob. As it cooled, water vapor escaped from the interior and condensed in the atmosphere. But the oceans hold much …