Olivine is a magnesium iron silicate mineral with the chemical formula $(Mg, Fe)_2SiO_4$. It crystallizes in mafic and ultramafic igneous rocks and constitutes one of the most important primary mineral sources of Magnesium (Mg) in parent material and soil weathering processes.

The Chipko Movement was a non-violent forest conservation movement initiated in 1973 in the Garhwal Himalayas (Reni village, Chamoli district, Uttarakhand) led by Sunderlal Bahuguna, Chandi Prasad Bhatt, and Gaura Devi. Villagers clung to (hugged) forest trees to prevent commercial loggers from felling them.

Living systems contain two main types of nucleic acids:

• Deoxyribonucleic acid (DNA): The primary genetic material in most organisms storing hereditary instructions.
• Ribonucleic acid (RNA): Acts in protein synthesis, gene regulation, and genetic transmission in certain viruses.

The sky appears blue due to Rayleigh scattering of sunlight by gas molecules ($N_2, O_2$) in the Earth's atmosphere. According to Rayleigh's law of scattering, the intensity of scattered light is inversely proportional to the fourth power of its wavelength ($I \propto 1/\lambda^4$). Shorter blue wavelengths (approx. 400-450 nm) are scattered nearly 10 times more effectively than longer red wavelengths, filling the clear sky with diffuse blue light.