The video explores how earthquakes help us understand Earth's structure. It begins by discussing the deepest mines and holes drilled, highlighting our limited exploration. Seismic waves, generated by earthquakes, are key to studying Earth's interior. P waves travel through solids and liquids, while S waves only move through solids. Seismic detectors worldwide capture these waves, revealing Earth's layered structure, including a solid inner core and a liquid outer core.

What is the depth of the deepest mine on Earth?

• 9 kilometers

• 1 kilometer

• 2.5 kilometers

• 4 kilometers

How deep is the deepest hole ever drilled into the Earth?

• 12 kilometers

• 28 kilometers

• 18 kilometers

• 22 kilometers

What is the approximate distance to the center of the Earth?

• 8000 kilometers

• 3200 kilometers

• 4800 kilometers

• 6400 kilometers

What do seismic waves help us understand about the Earth?

• The Earth's magnetic field

• The Earth's internal structure

• The Earth's weather patterns

• The Earth's surface features

Which type of seismic wave travels the fastest?

• S waves

• P waves

• Surface waves

• Rayleigh waves

Through which medium can S waves not travel?

• Gas

• Vacuum

• Liquid

• Solid

What causes the curved paths of P waves as they travel through the Earth?

• Absorption

• Diffraction

• Reflection

• Refraction

What does the P wave shadow zone indicate about the Earth's core?

• It is gaseous

• It is liquid

• It is solid

• It is empty

What is suggested by the larger shadow zone of S waves?

• A rocky core

• A solid iron core

• A liquid iron core

• A gaseous core

What have studies of seismic waves revealed about the Earth's core?

• It has a solid inner core and a liquid outer core

• It is entirely liquid

• It is hollow

• It is entirely solid