Exploring the deep ocean floor: Hot springs and strange creatures. The ocean floor is home to many unique communities of plants and animals. Most of these marine ecosystems are near the water surface, such as the Great Barrier Reef, a 2,000-km-long coral formation off the northeastern coast of Australia.
Quick Answer. Egyptian pyramids often took 10 years or more to complete. According to the Greek historian Herodotus, the Great Pyramid at Giza was built in 20 years by 100,000 workers and was meant to be a tomb for Pharaoh Khufu.
DAY 2: Scale of the Structures. Build around 2560 B.C., the Great Pyramid of Giza is the last survivor of the Seven Wonders of the World, and until the early 20th century was the tallest building in the world. The Great Pyramid dominates the plateau of Giza. Students can get a sense of the scale and magnificence of the pyramids from virtual reality views available through Pyramids: The Inside Story and on Nova: Pyramids. Building the Great Pyramid was a huge task. Your students can learn about it by watching the flash animation at the British Museum's Ancient Egypt site.