1. Pyramids of Egypt
... ,000-pound blocks of soft limestone, the outer layer of the Pyramid was made of a beautifully bright, protective layer of polished stone. These outer "casing stones" are missing today because Arabs stole them about 600 years ago, (This accounts for the very worn appearance of the Pyramid today, since the inner limestone ... 100-inch-thick, 20-ton block of hard, white limestone, similar to marble but superior in hardness and in durability against the elements. The casing stones, 144,000 in all, were so brilliant that they could literally be seen from the mountains of Israel hundreds of m...
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- Grade Level: High School