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.
The three main pyramids are-The Pyramid of Khufu. The Pyramid of Khafre. The Pyramid of Menkaure. Plus eight much smaller satellite pyramids. The plains of Giza are dominat â¦ ed by three pyramids, which were built by the pharaohs Khufu, Khafre, and Menkaure about 4,500 years ago.The Great Pyramid, built by Khufu, is approximately 482 feet tall, and the base is immense-each side is 756 feet long. It took more than twenty years to construct.he Pyramid of Khufu also known as The Great Pyramid of Giza and the Pyramid of Cheops [his Greek name] The Pyramid of Khafre is also known as the centre pyramid.