Loki’s Castle
Loki's Castle is a field of five active hydrothermal vents in the mid-Atlantic ocean.
Year Without a Summer
Missing rings are rare in oak and elm trees - the only recorded instance of a missing ring in oak trees occurred in the year 1816, also known as the Year Without a Summer.
Tsingy de Bemaraha
Tsingy de Bemaraha is a national park in Madagascar. The Tsingys are karstic plateaus in which groundwater has undercut the elevated uplands, and has gouged caverns and fissures into the limestone.
Surtsey
Surtsey is a volcanic island off the southern coast of Iceland. It was formed in a volcanic eruption which began 130 metres below sea level, and reached the surface on 14 November 1963.
Danxia landform
Danxia landform is formed from red-coloured sandstones and conglomerates of largely Cretaceous age.
Mount Roraima
Mount Roraima is the highest of the Pakaraima chain of tepui plateau in South America. The mountain includes the triple border point of Venezuela, Brazil and Guyana.
Stacks
A stack is a geological landform consisting of a steep and often vertical column or columns of rock in the sea near a coast, isolated by erosion.
Dracaena draco
This tree is the natural symbol of the island of Tenerife. When the bark or leaves are cut they secrete a reddish resin, one of the sources of the substance known as Dragon's blood, used to stain wood, such as of Stradivarius violins.
Melo melo pearl
Melo melo pearls are extremely large and generally very round. One of the largest discovered is nearly the size of a golf ball.
Darvaza
The Derweze area is rich in natural gas. While drilling in 1971 geologists accidentally found an underground cavern filled with natural gas. The ground beneath the drilling rig collapsed, leaving a large hole with a diameter of about 50-100 meters. To avoid poisonous gas discharge, it was decided to burn the gas. Geologists had hoped the fire would go out in a few days but it has been burning ever since.