While these prodigious structures were the centre of attention, a new and more significant technology was developing: the steel-framed high-rise building. The foundations of these high-rise buildings posed a major problem, given the soft clay soil of central Chicago. Reintroduction of concrete: the second industrial age also paved way for the reemergence of concrete in a new composite relationship with steel, creating a technology that would rapidly assume a major role in construction.
<h3>What other building techniques have been developed and improved?</h3>
Another building technique is Steel long-span construction. Long-span structures in steel developed more slowly than the high-rise in the years from 1895 to 1945, and none exceeded the span of the Gallery of Machines.
The concrete dome: Concrete was also used to long-span buildings, an early illustration being the Centennial Hall (1913) at Breslau, Germany (now Wrocław, Poland), by the architect Max Berg and the engineers Dyckerhoff & Widmann; its ribbed dome spanned 65 metres (216 feet), exceeding the span of the Pantheon.
Therefore, the correct answer is as given above
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