Discovery of the Giant Crystal Cave

In April 2000, miners in Nika, northern Mexico, discovered a remarkable cavern over 1,000 feet below the Earth's surface. This untouched cavern, hidden for half a million years, contained the largest crystals ever found. These enormous crystals, some large enough to walk across, have been growing for hundreds of thousands of years, showcasing a natural wonder far more mysterious than precious metals.

Where did the miners make their remarkable discovery in April 2000?

• Southern Mexico

• Eastern Mexico

• Western Mexico

• Northern Mexico

What was the nature of the discovery made by the miners?

• An ancient fossil

• A glittering cavern with large crystals

• A hidden treasure chest

• A new species of plant

How long had the cavern been untouched before its discovery?

• Half a million years

• A thousand years

• A hundred years

• A million years

What is notable about the size of the crystals found in the cavern?

• They are small and delicate

• They are medium-sized and fragile

• They are tiny and numerous

• They are large enough to walk across

For how long have the crystals been growing to reach their current size?

• Tens of years

• Hundreds of thousands of years

• Hundreds of years

• Thousands of years