Could you dig a hole to the other side of the earth? No, it’s not possible. The centre of the earth is about 6,400 kilometres beneath your feet. So it’s almost 13,000 kilometres to the other side of the earth. It’s too far to dig. And for most of that distance, the earth is either solid rock or metal so hot that it’s melted! Nobody could dig through that!
But if people could dig a hole through the earth, they would first have to go through a shell of rock. This rock formed long ago, when the outside of the earth cooled down. This rock is called the earth’s crust. The oceans and the continents cover the crust.
Under the crust is another layer of rock. It is called the mantle. The mantle is made of a different kind of rock than the crust. The deeper the mantle goes, the hotter it gets. At its bottom, it is hot enough to melt iron.
Beneath the mantle is a layer of melted metal – metal so hot that it’s thick like syrup! This layer is called the outer core.
In the very centre of the earth is the inner core. It’s a ball of hot, solid, squeezed-together metal.
Picture Credit : Google
