Weird Places: The Glowing Blue Lava at Kawah Ijen

The video explores the unique phenomenon of blue lava at Kawa Yuzhen in Indonesia, where sulfur gases combust to create blue flames. It explains the chemistry behind this, comparing the appearance of lava during day and night. The video also describes the turquoise acid lake in the crater, highlighting its dangerous acidity and the role of metal ions in its color. Finally, it discusses the potential hazards of volcanic activity in the densely populated region of Java.

What causes the blue flames observed at the Kawa Yuzhen crater?

• Presence of copper compounds.

• The lava itself is blue.

• Combusting sulfur gases.

• Reflection of the sky.

Why does the appearance of Kawa Yuzhen's lava change from day to night?

• The lava cools down at night.

• The lava changes its chemical composition.

• Sunlight washes out the blue color during the day.

• The sulfur gases stop burning during the day.

What makes the water in Kawa Yuzhen's lake appear turquoise?

• High salt concentration.

• Reflection of the sky.

• Dissolved metals and acids.

• Presence of algae.

What is the pH level of the lake at Kawa Yuzhen?

• Around 7, neutral.

• Below 0.5, extremely acidic.

• Exactly 1, mildly acidic.

• Above 7, basic.

Why is it important to monitor volcanic activity at Kawa Yuzhen?

• To study the unique blue lava.

• To collect sulfur for industrial use.

• To prevent tourists from visiting.

• Due to the potential eruption and dense population nearby.