YDS PARAGRAF DOLDURMA / TEST 5 38. Soru

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38.

New technologies have helped people build
taller and taller structures. Steel is one such
invention. ----The walls at its base had to be
bigger to support the extra weight. This is
why the tallest structures in the world for a
long time were the Egyptian pyramids.

Before steel was invented, a building was
supported by its outside walls

Steel is a strong, light metal made by
adding carbon to iron

When people first began building
skyscrapers, they covered the steel frame
with stone

Architecture changed dramatically when
steel was invented in the 1860s

This steel skeleton is what makes modern
skyscrapers possible

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