The Volcano That Burns Blue

Koala Jen volcano in Java, Indonesia, features a highly acidic Crater Lake and emits rare blue flames at night due to sulphuric gas combustion. The cooled gas forms yellow sulphur, which is mined despite the toxic and dangerous conditions. The volcano is both a challenging workplace and a unique natural wonder.

What is the temperature of the Crater Lake at the top of Koala Jen volcano?

• 80°F

• 70°F

• 100°F

• 90°F

What causes the bright blue flames at Koala Jen volcano?

• Reflection of the sky

• Lava

• Bioluminescent organisms

• Combustion of sulphuric gases

What color does the sulphur turn once the gases are cooled?

• Red

• Green

• Yellow

• Blue

What tool do miners use to extract sulphur at Koala Jen?

• Drills

• Shovels

• Steel bars

• Pickaxes

Why is mining at Koala Jen considered dangerous?

• Unstable ground

• Toxic gases

• Wild animals

• Steep cliffs