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.
The Empire State Building was built by construction workers who toiled at heights of up to 1,440 feet above the cityâs streets. Hereâs what to know about the brave souls who built the Empire State Building! At the peak of construction, there were 3,000 people working on the Empire State Building. Sky boys at work. Excavation for the Empire State Building began on January 22, 1930, less than three months after the Wall Street crash.