Over a period of more than 4500 years, people in different parts of the world built huge pyramids. The oldest Egyptian pyramids were started almost 4600 years ago, while the youngest pyramids in Central America were finished about 600 years ago. Each one took a long time to build, sometimes over 50 years, and involved thousands of people.Why did these civilizations opt for a pyramidal structure rather than a cube or a rectangle for their monuments? These experiments will help you to find out. In the first, by changing a cube into a pyramid, you end up with a structure that is three times taller than the original cube. A pyramid makes good use of material, by making the structure as high as possible. The second project shows that triangular shapes are more rigid than squares and do not collapse as easily. When an earthquake destroyed the Egyptian city Cairo 700 years ago, the pyramids stood firm. Modern materials and technology make it possible to build tall, rectangular buildings that are strong and stable.
BASES AND HEIGHTSYOU WILL NEED
Nonhardening modeling material, plastic modeling knife, ruler, book.
A QUESTION OF STRENGTHYOU WILL NEED
20 large, plastic drinking straws, reusable adhesive
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