The oceans hold about 321 million cubic miles (1.34 billion cubic kilometers) of water, which is roughly 97 percent of Earth’s water supply. Seawater’s weight is about 3.5 percent dissolved salt; oceans are also rich in chlorine, magnesium, and calcium.

What is inside the sea?

A wide variety of organisms, including bacteria, protists, algae, plants, fungi, and animals, lives in the sea, which offers a wide range of marine habitats and ecosystems, ranging vertically from the sunlit surface and shoreline to the great depths and pressures of the cold, dark abyssal zone, and in latitude from the …

What exactly is a sea?

In general, a sea is defined as a portion of the ocean that is partly surrounded by land. Given that definition, there are about 50 seas around the world. But that number includes water bodies not always thought of as seas, such as the Gulf of Mexico and the Hudson Bay.

What is inside the sea?

A wide variety of organisms, including bacteria, protists, algae, plants, fungi, and animals, lives in the sea, which offers a wide range of marine habitats and ecosystems, ranging vertically from the sunlit surface and shoreline to the great depths and pressures of the cold, dark abyssal zone, and in latitude from the …

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What’s under the deep sea?

The abyssal plain is the relatively level deep seafloor. It is a cold and dark place that lies between 3,000 and 6,000 meters below the sea surface. It is also home to squat lobsters, red prawns, and various species of sea cucumbers. For these creatures food is scarce most of the time.

Why is the ocean so deep?

The extreme depth of the Mariana Trench and other oceanic trenches is caused by subduction – where on the boundary of two converging tectonic plates, one descends down into Earth’s mantle, creating a deep trough.

Why is the sea salty?

Ocean salt primarily comes from rocks on land and openings in the seafloor. Salt in the ocean comes from two sources: runoff from the land and openings in the seafloor. Rocks on land are the major source of salts dissolved in seawater. Rainwater that falls on land is slightly acidic, so it erodes rocks.

Why is the ocean salty?

From precipitation to the land to the rivers to the sea The rain physically erodes the rock and the acids chemically break down the rocks and carries salts and minerals along in a dissolved state as ions. The ions in the runoff are carried to the streams and rivers and then to the ocean.

Where is the end of the sea?

The deepest part of the ocean is called the Challenger Deep and is located beneath the western Pacific Ocean in the southern end of the Mariana Trench, which runs several hundred kilometers southwest of the U.S. territorial island of Guam.

How old is the ocean?

The ocean formed billions of years ago. At this time, about 3.8 billion years ago, the water condensed into rain which filled the basins that we now know as our world ocean.

How much life is in the ocean?

An estimated 50-80% of all life on earth is found under the ocean surface and the oceans contain 99% of the living space on the planet. Less than 10% of that space has been explored by humans. 85% of the area and 90% of the volume constitute the dark, cold environment we call the deep sea.

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Does the sea have an end?

While this question appears to have a simple answer, the reality is that all the world’s waterways are connected to each other. There are no borders within the water itself, rather the names were human constructs given to different oceans in regard to around which bodies of land they flow.

What holds the ocean in place?

On the “near” side of the Earth (the side facing the moon), the gravitational force of the moon pulls the ocean’s waters toward it, creating one bulge. On the far side of the Earth, inertia dominates, creating a second bulge. In this way the combination of gravity and inertia create two bulges of water.

Why sea water is salty?

The two ions that are present most often in seawater are chloride and sodium. These two make up over 90% of all dissolved ions in seawater. The concentration of salt in seawater (its salinity) is about 35 parts per thousand; in other words, about 3.5% of the weight of seawater comes from the dissolved salts.

How deep is the water in the ocean?

The average ocean depth is 3.7 kilometers (2.3 miles). That’s 2.74 kilometers (1.7 miles) down! The average depth of the ocean is about 3,688 meters (12,100 feet).

What is inside the sea?

A wide variety of organisms, including bacteria, protists, algae, plants, fungi, and animals, lives in the sea, which offers a wide range of marine habitats and ecosystems, ranging vertically from the sunlit surface and shoreline to the great depths and pressures of the cold, dark abyssal zone, and in latitude from the …

What did the NASA find in the ocean?

To their amazement, the scientists discovered vibrant ecosystems around the vents, teeming with marine organisms, such as translucent snailfish and amphipods, tiny flea-like crustaceans, that had never been seen before. “With this discovery, we [came across] a whole new way of living on Earth,” says Shank.

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Why are we afraid of the ocean?

There are various reasons why someone may develop a fear of the ocean. A bad experience with water may lead to a fear response and phobia. For instance, if you nearly drowned while swimming in a lake or saw a shark in the ocean, you may develop an intense fear. Phobias can also develop without any experience or trauma.

Is there life under the sea?

Life may have first emerged in pools of water swirling among rocks. As scientists continue to find microbes deeper and deeper beneath the ocean floor, they are beginning to suspect that the right combination of rocks and water might be enough to sustain life almost anywhere.

Can you walk in the Dead Sea?

You can’t walk on the water of the Dead Sea. The water is rich in salt and minerals, so it has a silky, thick consistency that will keep you afloat if you’re swimming. But the buoyancy is not enough to walk on. You can, however, walk on large slabs of solid salt that form in the water, and along the shore.

What happens if you drink Dead Sea water?

That’s because accidentally swallowing Dead Sea salt water would cause the larynx to inflate, resulting in immediate choking and suffocation. Oh good. Likewise, the intensely salty water would instantly burn and likely blind the eyes—both reasons why Dead Sea swimmers rarely fully submerge their bodies, Ionescu noted.

Why does the Dead Sea turn red?

Geologists believe the red color of the pool near the Dead Sea may be caused by algae, iron oxide or added chemicals. A pool of water near the Dead Sea was recently found to have turned red.

About the Author

While living in a residential meditation and yoga ashram from 1999 to 2013, Leon devoted his life to the study and practice of meditation.
He accumulated about 15,000 hours of practice over many longer immersion retreats, including hours of silent meditation, chanting, prostrations, and mantra.
While participating in a "meditation marathon," he once sat in meditation for 40 hours straight. More importantly, he fell in love with meditation during this time.

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