Questions

Rust forms when oxygen reacts with chemicals in rocks, and that is often the case with many other elements in general. Like a copper nail being exposed to the air will rust.

The kidneys are stimulated to produce renin by a decrease in the blood pressure.

The renin-angiotensin system or RAS regulates blood pressure and fluid balance in the body. When blood volume or sodium levels in the body are low, or blood potassium is high, cells in the kidney release the enzyme, renin. Renin's primary function is therefore to eventually cause an increase in blood pressure, leading to restoration of perfusion pressure in the kidneys.

The Daman Ganga also called DawanRiver is a river in western India. The river's headwaters are on the western slope of the Western Ghats range, and it flows west into the Arabian SeaThere is an existing major irrigation project on the river called the Damanganga Reservoir Project, whichis located near Madhuban village in Dharampur taluka of Valsad district of Gujarat.It is an inter-state multipurpose project of the Govt. of Gujarat and Union Territories of Dadra & Nagar Haveli (D&NH) and Daman. The storage of this project is shared by the riparian states of Gujarat, Union Territories of Dadra & Nagar Haveli and Daman & Diu as beneficiary States.