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Why have the buildings in Petra, Jordan not eroded away?

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Different rocks have different competencies. There are sandstone rocks you can take and grind up by hand. There are other rocks that you can take a drill to and break the bit on. Sandstones have a lot of different properties that affect their hardness and susceptibility to erosion; grain size, sorting, angularity, and cementation. read more

Petra, Jordan continues to be a city puzzling archeologists and enticing tourists. First of all, it has been entirely carved out of sandstone. Second of all, it shows the evidence of once being a large luxurious metropolis in the middle of the desert. read more

Just inside the rock faces, benches line cavernous rooms hewn there thousands of years ago. The red rock walls ring the ancient city of Petra, where expert stonemasons made the monuments for gods, kings and wealthy citizens. The Al Khazneh, also known as the Treasury, is the largest monument in Petra. read more

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