Metamorphic rocks have been modified by heat, pressure and chemical processes, usually while buried deep below Earth's surface. Exposure to these extreme conditions has altered the mineralogy, texture and chemical composition of the rocks. There are two basic types of metamorphic rocks.Foliated metamorphic rocks such as gneiss, phyllite, schist, and slate have a layered or banded appearance that is produced by exposure to heat and directed pressure.uartzite is a non-foliated metamorphic rock that is produced by the metamorphism of sandstone. It is composed primarily of quartz. The specimen above is about two inches (five centimeters) across.
Sydney Tower. Sydney Tower is Sydney's tallest structure and the second tallest observation tower in the Southern Hemisphere. Auckland's Sky Tower is taller but Sydney Tower's main observation deck is almost 50 m (164 ft) higher than the observation deck on Auckland's Sky Tower.
1 Q1 is the 16th building on the Gold Coast to hold the tallest title since the first highrise in 1957. 2  The oval-shaped spire is one of the world's longest at 93.5 meters. 3  It starts at level 77 (230 meters high) and extends 47 meters above the glass fin. 4  Q1 is the tallest all-residential tower in the world. The spire weighs 110 tonnes and was put up in 8 tonne segments during June and July 2005, reaching full height on July 18. 2  Q1 Tower was the world's first all-residential building to exceed 1,000 feet in height. 3  The 74th floor has the highest external balconies in Australia, 217 meters above ground.