What is the name of the opening through which lava comes out during a volcanic eruption?

Which layer of the Earth is made of molten rock and causes volcanic eruptions?

What is the main cause of earthquakes?

Which instrument is used to measure the strength of an earthquake?

What scale is commonly used to measure earthquake magnitude?

Which type of volcano erupts regularly and frequently?

What do you call the point on the Earth's surface directly above the earthquake’s origin?

Which country has the most active volcanoes in the world?

What is magma called once it reaches the Earth's surface?

Which of the following can be caused by a powerful underwater earthquake?