पृथ्वी की सबसे आंतरिक परत (कोर/क्रोड) मुख्य रूप से किन तत्वों से बनी है?

The seismic boundary/discontinuity separating the Earth's crust and mantle is:

Which of the following discontinuities marks the boundary between the Earth's mantle and core?

At approximately what depth inside the Earth is the boundary between the mantle and the core located?

In which physical state is the outer core of the Earth present?

Which of the following layers of the interior of the Earth is in a liquid state?