Question

how can be the use of chemical fertilizer harmful? give your opinion ​

Answer 1

Answer:

Some of the harm chemical fertilizers may cause include waterway pollution, chemical burn to crops, increased air pollution, acidification of the soil and mineral depletion of the soil.

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Answer 2

Explanation:

Unification of the observable fundamental phenomena of nature is one of the primary goals of physics.[1][2][3]

The "first great unification" was Isaac Newton's 17th century unification of gravity, which brought together the understandings of the observable phenomena of gravity on Earth with the observable behaviour of celestial bodies in space.[2][4][5] The "second great unification" was James Clerk Maxwell's 19th century unification of electromagnetism, brought together the understandings of the observable phenomena of magnetism, electricity and light (and more broadly, the spectrum of electromagnetic radiation.[2] This was followed in the 20th century by Albert Einstein's unification of space and time, and of mass and energy. Later, quantum field theory unified quantum mechanics and special relativity.[2]

This process of "unifying" forces continues today, with the ultimate goal of finding a theory of everything – it remains perhaps the most important of the unsolved problems in physics. There remain four fundamental forces which have not been decisively unified: the gravitational and electromagnetic interactions, which produce significant long-range forces whose effects can be seen directly in everyday life, and the strong and weak interactions, which produce forces at minuscule, subatomic distances and govern nuclear interactions. Gravity and electromagnetism have been proposed together in the theory of Gravitoelectromagnetism. Electromagnetism and the weak interactions are widely considered to be two aspects of the electroweak interaction. Attempt to unify quantum mechanics and general relativity into a single theory of quantum gravity, a program ongoing for over half a century, have not yet been decisively resolved; current leading candidates are M-theory, superstring theory and loop quantum gravity.[2]