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 remarkable natural wonder.

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

• 90°F

• 70°F

• 80°F

• 100°F

Why do no species live in or around the Crater Lake of Koala Jen?

• The conditions are too harsh.

• The water is too cold.

• The area is too crowded.

• There is no food available.

What causes the bright blue flames at Koala Jen volcano?

• Bioluminescent organisms

• Reflection of the sky

• Lava

• Combustion of sulphuric gases

What is formed when the sulphuric gas cools at Koala Jen?

• Red lava

• Green algae

• Bright yellow sulphur

• Black ash

What makes the work of miners at Koala Jen volcano dangerous?

• Wild animals

• Steep cliffs

• Toxic gases

• Heavy rainfall