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.
25 facts about the Great Pyramid of Giza. The Great Pyramid a true masterpiece and has rightly earned the title of a âWonderâ. It was built with such precision that our current technology cannot replicate it. Historical analysis shows that the Pyramids were built between 2589 and 2504 BC.