dependent on mathematicians for our ideas regarding the physical state of the earth's interior; these ideas are based on extrapolation from physical constants obtained in the laboratory ...

The Earth has a layered structure made up of the core ... The inner core is made from solid iron and nickel. In this diagram, the red lines represent the edges of the tectonic plates that make ...

They then use this information to calculate the internal structure of the Earth. This is very similar to how doctors use ultrasound to image organs, muscles or veins inside the body without ...

More than a mere quirk in our planet's internal structure ... structures like echoes in a cave. A diagram showing seismic waves traveling through Earth. These waves are detected at the surface ...

By measuring seismic waves traveling through Earth, researchers have developed a solid understanding of its basic internal structure. So, what's inside Earth? Planet Earth is broadly composed of a ...