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www.reference.com/article/pyramids-7a8dc8b45154d95f

The ancient Egyptians built their stone pyramids as tombs for their pharaohs, whom they considered gods on Earth. Egypt experienced great prosperity and stability during the Old Kingdom era, further strengthening the pharaoh's position in society and allowing them to bu...

www.reference.com/article/pyramid-1c05c178302a9fe0

A pyramid refers to a polyhedron created by joining a polygonal base to triangular lateral faces. There are several types of pyramids, and each is named after the shape of its base. For example, a square pyramid has a square base, and a pentagonal pyramid has a base tha...

www.reference.com/article/old-pyramids-72bafcf6d2835de3

There are many pyramids in Egypt, but the oldest known pyramid is the Pyramid of Djoser, which finished construction in 2611 B.C. The most well-known pyramids are the Giza Pyramids, which finished construction in 2504 B.C.

www.reference.com/article/food-pyramid-f743a4a06fc499fb

The food guide pyramid is a well-known illustrative diet and nutrition guide developed in 1992. It was intended to aid the American public in making healthy food choices based on a pyramid hierarchy that places the most predominant foods, such as bread, rice, pasta and ...

www.reference.com/article/long-did-build-great-pyramid-ead099c0c1bb3cf1

The Great Pyramid of Giza took between 20 and 30 years to build. It was built for the Pharaoh Khufu and was finished in about 2560 BCE, making it over 4,500 years old. It is near two other Pharaohs' pyramids, as well as being part of its own complex, with three smaller ...

www.reference.com/article/population-pyramid-75ac7377b0c751ec

A population pyramid is a diagram of population distribution based on age and sex. The illustrated bar graph shows females on one side and males on the other. Along the vertical line are age groupings, such as 5 to 9 and 10 to 14, and along the horizontal line are popul...

www.reference.com/article/energy-pyramid-d024dfefbfb0c2a8

An energy pyramid is a graphical representation of how energy flows in an ecosystem The pyramid consists of trophic, or nutritional, levels. It shows how energy decreases and becomes less available for organisms as it enters every trophic level, as well as the amount of...