Thermokarst Lakes and Methane Emissions

What is the primary reason thermokarst lakes can be set on fire?

• The lakes contain oil deposits.

• The water in the lakes is flammable.

• Methane gas trapped under the ice is flammable.

• The ice itself is flammable.

What historical period are thermokarst lakes remnants of?

• The Jurassic Period

• The last Ice Age

• The Industrial Revolution

• The Renaissance

What is the main cause of permafrost thawing?

• Decreased rainfall

• Rising global temperatures

• Increased volcanic activity

• Deforestation

How much methane do thermokarst lakes emit annually?

• 1.5 teragrams

• 3.8 teragrams

• 10 teragrams

• 50 teragrams

What is a potential consequence of all Earth's permafrost thawing?

• Rise in sea levels by 3 to 10 centimeters

• Reduction in greenhouse gases

• Decrease in global temperatures

• Increase in forest areas