What is the primary cause of the vibrant colors seen in the Aurora Borealis and Aurora Australis?

Charged particles from the sun interacting with Earth's magnetic field

Sunlight reflecting off atmospheric ice crystals

Bioluminescent algae in the upper atmosphere

Volcanic ash particles scattering light

What natural phenomenon is responsible for the formation of the 'Door to Hell' crater in Turkmenistan, burning for decades?

A continuous volcanic gas vent eruption

Geothermal heat igniting trapped methane

Ignition of a massive natural gas deposit after a collapse

Spontaneous combustion of underground coal seams

Glacial moraines from a past ice age

Ancient coral reefs exposed by tectonic uplift

Deposits of hardened mud from ancient lake beds

Erosion of volcanic ash deposits by rainwater

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