An estuary is a semi-enclosed coastal body of water which has a free connection with the open sea and within which sea water is measurably diluted with fresh water derived from land drainage. Estuaries form a transition zone between river environments and maritime environments. They are subject both to marine and riverine influences.

Correct Option: A

An estuary is a semi-enclosed coastal body of water which has a free connection with the open sea and within which sea water is measurably diluted with fresh water derived from land drainage. Estuaries form a transition zone between river environments and maritime environments. They are subject both to marine and riverine influences.

The largest water reservoir is the ocean, containing 97.3% of all water on Earth. Only 2.8 % of all the water on Planet Earth is fresh water. Three-quarters of all fresh water on Earth is frozen in glacier ice. So glacier ice is the second largest reservoir of water on Earth and the largest reservoir of fresh water on Earth!

Correct Option: A

The largest water reservoir is the ocean, containing 97.3% of all water on Earth. Only 2.8 % of all the water on Planet Earth is fresh water. Three-quarters of all fresh water on Earth is frozen in glacier ice. So glacier ice is the second largest reservoir of water on Earth and the largest reservoir of fresh water on Earth!

Water makes up 70.8% of the Earth’s surface, while the other 29% consists of continents and islands. To break the numbers down, 96.5% of all the Earth’s water is contained within the oceans as salt water, while the remaining 3.5% is freshwater lakes and frozen water locked up in glaciers and the polar ice caps.

Correct Option: B

Water makes up 70.8% of the Earth’s surface, while the other 29% consists of continents and islands. To break the numbers down, 96.5% of all the Earth’s water is contained within the oceans as salt water, while the remaining 3.5% is freshwater lakes and frozen water locked up in glaciers and the polar ice caps.

The Arctic Ocean is the smallest of the world’s five ocean basins. With an area of about 5.4 million square miles, the Arctic Ocean is about 1.5 times as big as the United States. It is bordered by Greenland, Canada, Norway, Alaska, and Russia. It is almost completely covered with ice for the majority of the year.

Correct Option: D

The Arctic Ocean is the smallest of the world’s five ocean basins. With an area of about 5.4 million square miles, the Arctic Ocean is about 1.5 times as big as the United States. It is bordered by Greenland, Canada, Norway, Alaska, and Russia. It is almost completely covered with ice for the majority of the year.

Water conservation encompasses the policies, strategies and activities to manage fresh water as a sustainable resource, to protect the water environment, and to meet current and future human demand. Rain water harvesting, sustainable water use and natural regeneration of vegetation are some of the holistic ways for conserving water.

Correct Option: D

Water conservation encompasses the policies, strategies and activities to manage fresh water as a sustainable resource, to protect the water environment, and to meet current and future human demand. Rain water harvesting, sustainable water use and natural regeneration of vegetation are some of the holistic ways for conserving water.