Petrified Forest National Park
The park features one of the world's largest and most colorful concentrations of petrified wood.
The park features one of the world's largest and most colorful concentrations of petrified wood.
Couroupita guianensis is native to tropical northern South America and to the southern Caribbean. They produce large spherical and woody fruits ranging from 15 to 24 cm in diameter, containing up to 200 or 300 seeds apiece.
Stories of animals - mostly toads - found alive when a stone or a lump of coal is broken open date back centuries.
Racetrack Playa is a seasonally dry lake located in the northern part of the Death Valley National Park, California. It is famous for "sailing stones", rocks that mysteriously move across its surface.
Agarwood is created when Aquilaria trees, which were traditionally planted around villages for their Feng Shui properties, are damaged, allowing a mould to attack the timber. When harvested, the infected, dark, resinous wood is pared away from the healthy, scentless, cream-coloured wood. The resin is especially coveted for its use in perfume and incense. Agarwood resin is distilled to create Oud oil, which is an essential ingredient in high-end perfumes.
Coober Pedy is a town in northern South Australia. The town is known as the opal capital of the world because of the quantity of precious opals that are mined there. It is also famous for most of the residents living below ground, mostly in old mines refurbished, due to the scorching daytime heat.
Diatoms are a major group of microorganisms found in the oceans, waterways and soils of the world. Living diatoms number in the trillions: they generate about 20 percent of the oxygen produced on the planet each year; take in over 6.7 billion metric tons of silicon each year from the oceans in which they live; and contribute nearly half of the organic material found in those oceans. The shells of dead diatoms can reach as much as a half mile deep on the ocean floor; and the entire Amazon basin is fertilized annually by 27 million tons of diatom shell dust transported by westerly transatlantic winds from the bed of a large dried up lake once covering much of the African Sahara. Diatoms are unicellular; they can live alone or form colonies, taking shapes such as ribbons, fans, zigzags, and stars.
Deadvlei is a white clay pan located near the more famous salt pan of Sossusvlei. Dead Vlei is surrounded by the highest sand dunes in the world, the highest reaching 300-400 meters. The clay pan was formed after rainfall, when the Tsauchab river flooded, creating temporary shallow pools where the abundance of water allowed camel thorn trees to grow. When the climate changed, drought hit the area, and sand dunes encroached on the pan, which blocked the river from the area. The trees died, as there no longer was enough water to survive. There are some species of plants remaining, adapted to surviving off of the morning mist and very rare rainfall. The remaining skeletons of the trees, which are believed to be about 900 years old, are now black because the intense sun has scorched them. Though not petrified, the wood does not decompose because it is so dry.
Prized for its beauty, shade, and medicinal properties, the cultivar was thought to have become extinct sometime around AD 150. However, in 2005, a preserved 2,000-year-old seed sprouted. It is the oldest known human-assisted germination of a seed.
Sima Humboldt is an enormous sinkhole located in Venezuela.