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.
Built during the Depression between 1930 and 1931, the Empire State Building became the world's tallest office building -- surpassing the Chrysler Building by a whopping 204 feet.