Original answer: I believe that the US Naval Observatory is the official time keeper of the United States.The rest of the story: The USNO is one half of the equ Read more Chemistry +1 What is bouyance? Asked by Wiki User Buoyancy is the ability of an object to float in a liquid or gas. It is determined by the difference in density between the object and the fluid it is in, with Read more Chemistry +3 Why does Pepto-Bismol turn black when you mix it with contaminated water? Asked by Wiki User Pepto-Bismol is made with bismuth subsalicylate, which can react with sulfur compounds present in contaminated water to form bismuth sulfide.

This chemical reac Read more Units of Measure +3 Why the sea water is blue? Asked by Wiki User The blue color of sea water is due to the way it absorbs and scatters sunlight. Water molecules absorb red, orange, yellow, and green light waves more strongly, Read more Science +3 Polution effect on sky color? Asked by Wiki User Air pollution can cause the sky to appear more gray or hazy by scattering sunlight and reducing visibility.

Pollutants like particulate matter and nitrogen oxid Read more Chemistry +3 Why do starfish filter the sea water? Asked by Wiki User Starfish filter sea water to extract nutrients and oxygen. They use their tube feet and specialized structures called podia to create water currents that bring Read more Global Positioning Systems (GPS) +3 What is slot working mechanism in railway control panel and how is it useful to the station master? Asked by Saineeru In railway control panels, the raffi 888 slot working mechanism is a method of assigning specific time slots for trains to pass through a particular section of the track.

Read more Units of Measure +3 Why is sea in color blue? Asked by Wiki User The ocean appears blue because water absorbs colors in the red part of the light spectrum, making the blue light that is reflected dominate our perception of it Read more War and Military History +2 Is ironclad ship supposed to be capitalized? Asked by Wiki User Ironclad ship is not required to be capitalized unless it is at the beginning of a sentence or part of a title.