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Where is the famous Cave of the Crystals?

in Switzerland

in USA

in Mexico

in South Africa

The cave near Naica, Mexico, was discovered in 2000 by miners. At that time, it was completely submerged. Today, the cave is accessible because the mining company's pumping operations keep it clear of water. Unfortunately, the crystals deteriorate in air, and soon may be lost.

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5

Alexander Van Driessche

cavescrystalsfamous placesfamous places of Mexicofamous places of North Americageographygeography of Mexicogeography of North AmericageologyMexicoNorth America

Caves quiz Mexico quiz Geography of North America quiz

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Apart from the United States of America, which other country in the world is officially named "United States"?

Which border is that?

between the USA and Mexico

between Iraq and Kuwait

between Israel and Syria

between China and Russia

To which country does Baja California peninsula belong?

This photo has been taken at a seaglass beach in Hawai'i. How is the sea glass formed?

from lava droplets that fall to the sea during land volcano explosions

in deepwater volcano explosions

during lightning strikes