Fluids are an important agent of metamorphism. Most rocks contain some water, but sedimentary rocks hold the most. First there is the water that was trapped in the sediment as it became rock. Second is the water that is liberated by clay minerals as they change back to feldspar and mica.he Four Agents of Regional Metamorphism. Heat and pressure usually work together, because both rise as you go deeper in the Earth. At high temperatures and pressures, the minerals in most rocks break down and change into a different set of minerals that are stable in the new conditions.
Browse â World â Biggest, Tallest, Fastest. The Empire State Building is one of New York City's most famous landmarks. Built in 1930, it is 102 stories and 1,454 feet (443.2 meters) tall when measured from the ground to the very tip of its lightning rod. Until the completion of the World Trade Center in 1972 (and once again, following the 2001 destruction), the Empire State Building was the tallest building in New York State.
In 1972, the Empire State Building lost its title as worldâs tallest building to New Yorkâs World Trade Center, which itself was the tallest skyscraper for but a year. Today the honor belongs to Dubaiâs Burj Khalifa tower, which soars 2,717 feet into the sky.n this day in 1931, President Herbert Hoover officially dedicates New York Cityâs Empire State Building and presses a button that turns on the buildingâs electrical lights. Hoover was not actually in New York for the dedication.