Because it is to help urban people to more modern just like in city areas
Explanation: The standard unit of velocity is metre per second. Velocity can be defined as the displacement of a body per unit time.
Acid rain threatens the world's food supply.
Acid rain is a global issue.
Claiming it as a historic item (which it is) through a document prevents common people to be affiliated with harming it. So by saying it is of significant history, citizens and tourists will not be able to do anything to jeopardize the natural landmark
