WBPSC Prelims and Mains Notes-WBPSC Test Series
Beginning of the Universe started about 13.6 billion years ago,when the Big Bang created the universe from a point source. During this process, light elements, like H, He, Li, B, and Be formed. From this point in time, the universe began to expand and has been expanding ever since. Concentrations of gas and … Read more
The uppermost outer solid and rigid layer of the earth is called crust. Its thickness varies considerably. It is as little as 5 km thick beneath the oceans at some places but under some mountain ranges it extends upto a depth of 700km. Below the crust denser rocks are found, known as mantle crust. … Read more
What is a Biosphere Reserve? A Biosphere Reserve is a special ecosystem or a specialized environment with a flora and fauna that require protection and nurturing. These reserves are managed and studied for the conservation of various life forms found here. They are subjects of scientific and natural interest. According to UNESCO, “Biosphere reserves … Read more