Questions

Who is the first woman to climb mount everest in the world ?

The process of soil formation is called

What is relative path and absolute path?

The four main systems of the earth are

In the following question, out of the four alternatives, select the alternative which is the best substitute of the phrase.

An achievement or something desired fail to be attained by someone

Activation of the receptors by stimuli is called

Which among the following countries of South America does the Tropic of Capricorn not pass through?

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Crude mineral oil comes out of the earth as a thick brown or black liquid with a strong smell. It is a complex mixture of many different substances, each with its own individual qualities. Most of them are combinations of hydrogen and carbon in varying proportions. Such hydrocarbons are also found in other forms such as bitumen, asphalt and natural gas. Mineral oil originates from the carcasses of tiny animals and from plants that live in the sea. Over million of years, these dead creatures form large deposits under sea­bed and ocean currents cover them with a blanket of sand and silt. As this material hardens, it becomes sedimentary rock and effectively shuts out the oxygen, thus preventing the complete decomposition of the marine deposits underneath. The layers of sedimentary rocks become thicker, and heavier. Their pressure produces heat, which transforms the tiny carcasses into crude oil in a process that is still going on today.

The time taken for the marine deposits to harden into rocks is