By- Shivanshi Srivastava
Earth is composed of four distinct layers, based on their density.
The outermost layer is called crust, then comes the mantle, followed by the outer core and finally, the inner core, which is mostly liquid.
Except for the crust, no one has ever explored other layers in person.
Scientists have been studying other layers, particularly the core, in details for decades but are yet to fully understand it.
Recently, researchers has revealed that water from Earth's surface can reach deep into the planet and cause changes in the outer core.
It was found that when water reaches the core-mantle boundary, it reacts with silicon in the core, forming silica.
When the water reaches the core-mantle boundary, about 2,900 kilometres beneath the surface, it triggers a powerful chemical reaction.
This reaction creates results a hydrogen-enriched top core layer and transports silica to the lower mantle.
The Earth's core-mantle boundary undergoes a sharp transition from silicate to metal, creating a film-like layer.