Geological Phenomena and Theories

What is the primary suspected cause of the massive craters appearing in Siberia?

• Meteor impacts

• Volcanic eruptions

• Methane gas explosions

• Earthquakes

What is the main challenge in studying the Siberian craters directly?

• Remote location

• High pressure and risk of explosion

• Dense vegetation

• Lack of funding

Which geological feature in Canada is thought to be a near-perfect circle?

• Lake Manicouagan

• Nastapoka Arc

• Hudson Bay

• Great Slave Lake

What geological process is suggested to have formed the Nastapoka Arc?

• Glacial movement

• Erosion

• Tectonic plate collision

• Volcanic activity

What is one hypothesis for the low gravity anomaly in the Indian Ocean?

• A massive meteor impact

• A dent in the Earth's mantle

• A giant underwater cavern

• A large underwater volcano

What type of rock is unexpectedly found on the volcanic island of Anjouan?

• Limestone

• Quartzite

• Granite

• Basalt

What is the hypothesized origin of the quartzite found on Anjouan?

• Meteor impact

• Formation from ocean sediments

• Transport from the African continent

• Local volcanic activity

What is the leading theory for the formation of Mima mounds?

• Volcanic activity

• Pocket gophers

• Wind erosion

• Earthquakes

What is the frequency of the mysterious Earth rumble detected by seismometers?

• Every 26 seconds

• Every hour

• Every minute

• Every 10 seconds

What is one possible explanation for the source of the 26-second Earth rumble?

• Volcanic eruptions

• Ocean waves hitting the continental shelf

• Meteor impacts

• Tectonic plate movements