Water covers most of the Earth's surface, about 71% of it. The vast majority of this water is in the form of oceans, which cover approximately 361 million square kilometers (139 million square miles) of the Earth's surface.

• Water covers most of the Earth's surface, about 71% of it. The vast majority of this water is in the form of oceans, which cover approximately 361 million square kilometers (139 million square miles) of the Earth's surface. The remaining surface area of the Earth is made up of continents and islands. The largest continents are Asia, Africa, North America, South America, Antarctica, Europe, and Australia, with a combined land area of approximately 148 million square kilometers (57 million square miles).

• Earth's surface is covered by atmosphere.
• Water covers about 70%. Land covers about 30%. But the atmosphere covers 100%.
• There is atmosphere above earth's surface.
• But if you say the whole earth then, the answer is space. Space also covers 100% of the atmospheric surface of earth.

Hence, Option Correct is D.

Historically, there are four named oceans: the Atlantic, Pacific, Indian, and Arctic. However, most countries - including the United States - now recognize the Southern (Antarctic) as the fifth ocean. The Pacific, Atlantic, and Indian are the most commonly known. The Southern Ocean is the 'newest' named ocean.

• Planet Earth, when viewed from space, has been described as a "blue marble." This is, of course, because it's covered in water. Our planet sustains life partially thanks to the 321,003,271 cubic miles (1,338,000,002 cubic kilometers) of salt water that continually circulates around and between the comparatively small bits of exposed land.

How Many Oceans Are There in the World?

• Pacific Ocean
• Atlantic Ocean
• Indian Ocean
• Southern Ocean
• Arctic Ocean

The Atlantic, Indian and Pacific freeze together around Antarctica.

How Do We Separate the World's Oceans?

• There are no real barriers between the world's oceans like there are with landmasses, mostly because bodies of water are often what we use to create geographical boundaries. Just like an island's borders are drawn by water, continents mostly use oceans to describe their boundaries. There is only one global ocean, and yet we have to make distinctions between areas, for geography's sake.
• In 1999, the National Oceanic and Atmospheric Administration (NOAA) decided that the Southern Ocean should be recognized as a separate body of water, but it took until 2021 for the IHO and the National Geographic Society to recognize it as separate from the Pacific Ocean.

The 5 Oceans of Planet Earth

• All the oceans are pretty similar — after all, they're all the same body of water. However, differences in temperature, salinity and density exist between the oceans
• . For instance, the Atlantic Ocean is slightly saltier than the Pacific, due to a dizzying number of factors, from the way the water cycle works to the effects of hydrothermal vents.

Hence, Option B is correct Answer.

The presence of water vapours in the atmosphere causes Condensation and Precipitation.

The water cycle is a cycle where all forms of water follow as it moves around Earth in different states. The presence of vapors of water in liquid form is found in lakes, oceans, rivers, and even in some amount underground. Water is all over Earth in the ocean, on land, and in the atmosphere. The four major stages are present or found in the water cycle. The stages of the water cycle are given below.

• Evaporation: Evaporation occurs when heat obtained from solar radiation causes water from water sources such as streams, ice, oceans, lakes, and soils to rise into the air and turn into water vapor. Droplets of vapors of water are joined together and result in the making of clouds. 

• Condensation: In the stage of condensation the water vapor present in the air cools down and turns back into liquid water.

• Precipitation: When the water in the form of sleet, rain, hail, and snow falls from clouds in the sky it is precipitated.

Hence, option D is correct.