The video explores the complex structure of Earth's interior, challenging the traditional view of neat layers. It highlights the discovery of a mountain range between the upper and lower mantle, which may hold clues to Earth's missing elements. Seismic waves from earthquakes help scientists study these deep regions, revealing rough and chemically distinct mantle boundaries. These findings suggest ancient oceanic crust may be trapped in the mantle, potentially containing hidden elements. The video emphasizes the dynamic and intricate nature of Earth's structure.

What unusual geological feature was discovered between the upper and lower mantle?

• A vast ocean

• A mountain range

• A deep canyon

• A large desert

Why is the lower mantle considered a prime suspect for Earth's missing elements?

• It is easily accessible for drilling.

• It contains visible deposits of these elements.

• It is the only place we have explored extensively.

• It is one of the few large areas we haven't explored.

How do seismic waves help scientists study the Earth's interior?

• By measuring surface temperatures

• By drilling into the Earth's core

• By bouncing off different rock layers

• By creating artificial earthquakes

What did the 2019 study reveal about the lower mantle boundary?

• It is smooth and even.

• It is full of large, rugged mountains.

• It is colder than the upper mantle.

• It is composed entirely of liquid magma.

What is the hypothesized composition of the mountains in the lower mantle?

• Volcanic ash

• Pure silicon

• Ancient oceanic crust

• Solid iron