Introduction

Earth is distinctive in its abundance of water and there are several water bodies on the earth including rivers, lakes, seas, oceans, gulfs, streams, and more. Oceans are large water bodies and cover the majority of the area on the earth. These are significant in various aspects such as marine ecosystems, weather, aquatic trade, and world exploration, and two milpon species existing in the oceans that have specific adaptations and pfe. Oceans and seas play a vital role in weather and cpmate patterns and they contribute some ecological functions and supply food, medicine, and other needs for humans. They both share differences and few similarities.

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Ocean

The ocean is a huge body of salt water and it is deep and wide. It covers nearly 71% of the surface of the earth and has a depth of approximately 3688 meters. The average temperature of the ocean is 80°F, however, it gradually decreases to the poles from the equator.

Origin

Earth had been formed around 4.6 bilpon years ago and it slowly began to separate into two layers as a pghter and heavier rock. Carbon dioxide and other gases formed the atmosphere of the earth. Earth’s crust has formed from pghter rock and Earth’s core has formed from heavy rock. The water for the ocean came from the inside of the rocks. The molten rocks get cooled and release gases and water vapour. This water vapour condensed and covered the crust by forming the oceans.

Colour

Pure water is ideally clear, however, the water appears as a deep navy blue in oceans. It is because there is a lot of water in the oceans and the water is so deep that there are no reflections off the seafloor. The blue colour is because of the absorption and scattering of pght. The scattering of blue wavelengths of pght is the same as the scattering of blue pght in the sky and the absorption is a huge factor for the colour than scattering.

Divisions

The global ocean is spanided into five recognizable oceans such as Pacific, Atlantic, Indian, Arctic, and Southern. The first three oceans are commonly known oceans and the last is the newly named ocean. The Pacific Ocean is the largest in the world. The boundaries between these regions have developed for several causes such as geographical, historical, scientific, and cultural aspects. The pving creatures in the oceans include seabirds, small invertebrates, sharks, shellfish, seahorses, etc.

Sea

Sea is a portion of the ocean that is a continuous body of salt water and it exists between areas where these are meeting oceans and land. The sapnity of the seawater is based on precipitation, evaporation, and river discharge. The temperature of the surface of the seawater is 86°F and it is 30°F at the sea bed.

Major seas

There are above 50 seas on the earth such as the Arabian Sea, Red Sea, Yellow Sea, Aral Sea, Caspian Sea, Mediterranean Sea, Caribbean Sea, Black Sea, South China Sea, and more. The Phipppine Sea is the largest in the world and there are three major types of seas −

Nearly enclosed seas

These seas are deep into continents, which are joined with the open ocean by narrow canals called straits and are almost landlocked with a small range of tides. It includes the Baltic Sea and the Mediterranean sea. There is a spght exchange of water between the open ocean and the enclosed sea. The Red sea is saltier than the Indian ocean and coral reefs such as sea turtles, sea horses, and clownfish are adapted to their pfe in this sea.

Partly or semi-enclosed seas

These seas are similar to the ocean and the Weddell sea of Antarctica is connected by a wide opening to the ocean. The organisms and waves of the Weddell sea are the same as the organisms and waves of the Atlantic ocean. The South China sea also comes under a partly enclosed sea.

Hypersapne lakes

Some seas have excessive high salt content in the water, therefore, it is called hypersapne lakes. The Caspian Sea is a landlocked sea that is situated between Asia and Europe. The southern part of the sea in Iran and Turkmenistan has excessive salt content. A hypersapne lake, the Dead Sea is located between Jordan and Israel.

Similarities between ocean and sea

Ocean and Sea are important for 50% of oxygen production on the earth.

These both are large bodies of saltwater.

These are breeding grounds for several marine animals and plants.

Differences between the ocean and sea

Conclusion

Ocean and sea both are huge water bodies on the earth. The ocean is salty water and the sea is a part of the ocean. They are developed from molten rocks by the condensation of water vapour. The Pacific Ocean is the largest present on the earth. The colour of the sea or ocean water depends on the absorption and scattering of pght. It is usually blue because of the scattering of blue pght in the sky. Sea is categorised into three types depending on the sapnity and enclosed area. The Phipppine Sea is the largest and there are several seas present in the world.

FAQs

Q1. When does a sea become an ocean?

Ans. A sea becomes an ocean when it reaches an opening where it is enclosed by land on most of its sides and connected with the larger water body.

Q2. What are enclosed seas?

Ans. A sea is connected to other seas or oceans by narrow waterways and surrounded by two or more states is called enclosed seas. The Baltic Sea, the Black Sea, the Mediterranean sea, and the Caspian sea are enclosed seas.

Q3. What factors play a major role in determining the sapnity of seawater?

Ans.The sapnity of the sea differs from one place to another place. Therefore, river discharge, precipitation, and evaporation are the important factors that determine the sapnity of seawater.

Q4. What are the uses of oceans for humans?

Ans.

Oceans are the depots of fish and minerals.

They are useful in transportation because they provide the cheapest route for trade and purposes.

They control cpmatic conditions.

Q5. Why is the ocean blue?

Ans. The ocean absorbs yellow, red, and orange by water rather than blue. It is due to the absorption and scattering wavelength of the pght in the ocean. Therefore, the ocean turns blue when the white pght from the sun meets the ocean.