Naica Crystal Caves

Multiple Choice

Where are the Naica Crystal Caves located?

• United States of America

• Canada

• Mexico

• Brazil

Multiple Choice

Where are the largest natural crystals known to man located?

• Chihuahua, Mexico

• Cairo, Egypt

• Paris, France

• Tokyo, Japan

Multiple Choice

What is the approximate length of one of the clear selenite crystals mentioned?

• 20 feet

• 50 feet

• 100 feet

• 10 feet

Multiple Choice

How much does one of the clear selenite crystals weigh?

• 10 tons

• 25 tons

• 55 tons

• 5 tons

Multiple Choice

Where have the largest natural crystals on Earth been discovered?

• In a gold mine in California, USA

• In a diamond mine in South Africa

• In a silver and zinc mine near Naica, Mexico

• In a coal mine in Australia

Multiple Choice

What mineral are the largest natural crystals composed of?

• Quartz

• Selenite

• Calcite

• Amethyst

Multiple Choice

What is the name of the chamber holding the large crystals in the Naica Mine?

• Crystal Cave of Wonders

• Crystal Cave of Giants

• Crystal Cave of Secrets

• Crystal Cave of Treasures

Multiple Choice

How deep is the Crystal Cave of Giants located in the Naica Mine?

• 500 feet

• 750 feet

• 1000 feet

• 1250 feet

Multiple Choice

In which year did Eloy and Javier Delgado discover the world's largest crystals?

• 1995

• 2000

• 2010

• 1985

Multiple Choice

Reflect means_________.

• light bounces back

• light goes through and bends.

• light goes straight through.

• light gets taken in.

Multiple Choice

What is the temperature inside the cave mentioned in the text?

• 100 degrees Fahrenheit

• 150 degrees Fahrenheit

• 200 degrees Fahrenheit

• 50 degrees Fahrenheit

Multiple Choice

How long can a human function in the environment described before severe loss of mental functions occurs?

• 1 to 2 minutes

• 3 to 5 minutes

• 6 to 10 minutes

• 11 to 15 minutes

Multiple Choice

What does the mining company plan to do before opening the caves to the public?

• Install new lighting

• Air-condition the caves

• Build new pathways

• Add more crystals

Multiple Choice

How old are the limestone massifs mentioned in the text?

• 100 million years old

• 200 million years old

• 300 million years old

• 400 million years old

Multiple Choice

What elements were deposited by the thermal waters as they cooled?

• Gold, copper, and iron

• Lead, zinc, and silver

• Nickel, tin, and aluminum

• Platinum, mercury, and cobalt

Multiple Choice

What was released when the limestone walls dissolved?

• Calcium

• Iron

• Magnesium

• Sodium

Multiple Choice

What did the calcium combine with to form crystals?

• Sulfur

• Oxygen

• Carbon

• Hydrogen

Poll

Which part of the Naica Cave do you find the most fascinating?

• The giant selenite crystals

• The underground location (it's deep inside a mountain!)

• The temperature and conditions (extremely hot and humid!)

• The fact that it's been mostly untouched by humans