The natural gas is harnessed from the Marcellus Shale by using the technique of hydraulic fracturing.
<u>Explanation:</u>
The Marcellus Shale is a sedimentary rock about 7,000 to 12,000 feet below the Earth's surface lying beneath the states of New York, West Virginia, Ohio and Pennsylvania.
It is one of the world's richest deposits of natural gas. To extract the natural gas from this shale, the technique of hydraulic fracturing is used in which the Earth is drilled vertically and hydraulic agents like water and other chemicals are introduced into the Earth's surface at high pressure, forcing the gas to rise up to the surface.
Both vertical and horizontal Marcellus Shale wells produce marketable quantities of natural gas. The drilling process focuses first on reaching – and protecting – water-bearing zones beneath the ground. This allows for the extraction of larger quantities of natural gas from a single wellhead.
Because the Earth rotates through two tidal “bulges” every lunar day, coastal areas experience two high and two low tides every 24 hours and 50 minutes. High tides occur 12 hours and 25 minutes apart.
The Himalayan mountain range and Tibetan plateau have formed as a result of the collision between the Indian Plate and Eurasian Plate which began 50 million years ago and continues today.
