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WHAT CAUSED THE COLLAPSE OF THE MAYAN CIVILISATION

For hundreds of years the Mayans dominated large parts of the Americas until, mysteriously in the 8th and 9th century AD, a large chunk of the Mayan civilisation collapsed.

The reason for this collapse has been hotly debated, but now scientists say they might have an answer - an intense drought that lasted a century.

Studies of sediments in the Great Blue Hole in Belize suggest a lack of rains caused the disintegration of the Mayan civilisation, and a second dry spell forced them to relocate elsewhere.

The theory that a drought led to a decline of the Mayan Classic Period is not entirely new, but the new study co-authored by Dr André Droxler from Rice University in Texas provides fresh evidence for the claims.

Dozens of theories have attempted to explain the Classic Maya Collapse, from epidemic diseases to foreign invasion. 

With his team Dr Droxler found that from 800 to 1000 AD, no more than two tropical cyclones occurred every two decades, when usually there were up to six.

This suggests major droughts occurred in these years, possibly leading to famines and unrest among the Mayan people. 

And they also found that a second drought hit from 1000 to 1100 AD, corresponding to the time that the Mayan city of Chichén Itzá collapsed. 

Researchers say a climate reversal and drying trend between 660 and 1000 AD triggered political competition, increased warfare, overall sociopolitical instability, and finally, political collapse - known as the Classic Maya Collapse.

This was followed by an extended drought between AD 1020 and 1100 that likely corresponded with crop failures, death, famine, migration and, ultimately, the collapse of the Maya population.

He said the cenotes that surround the pyramid could represent the four points of the compass.

The river at the center might represent the center of the Maya's universe, which they thought of as a tree with roots reaching below ground.

The National Institute of Anthropology and History also said research at another Mayan site, Uxmal, found an usually high number of medicinal plants growing nearing the structure known as the governor's palace.

Uxmal site director Jose Huchim Herrera said the concentration of such plants was so much higher in the sacred area than in surrounding fields, that it indicates the Mayas planted them there intentionally as a sort of medicinal garden. The site has about 150 species used to treat snake bites, stomach infections and fevers.