Earth is the third planet from the Sun. It is the only object in the universe that is known to harbor life. Its surface is covered with land, with 29.2% of the planet’s surface consisting of continents and islands. In fact, it is the only object in the universe that has liquid water, but there are other bodies of water – like the moon – that we know of. The oceans make up the remaining 75 percent.


The Earth’s mantle is 3,000 kilometers thick and begins approximately 30 kilometers beneath the surface. It is composed of magnesium, iron, and silicon. The mantle is dense and semi-solid, and it circulates much more slowly than the layer below it. This layer’s temperatures are above the melting point of rock, forming partly melted rocks. In fact, the Earth’s mantle is the weakest part of the entire planet, and it is this portion of the planet that the tectonic plates slide over.

The mantle is a thick layer of rock beneath the crust. It flows as slowly as your fingernails. The outer core is made of liquid iron and nickel and moves around the inner core. The inner core is a solid ball of iron and nickel that is hotter than the surface of the Sun. While it is difficult to determine which layer is more complex, the layers of the Earth work together to create a complex system. Each layer is essential to the functioning of the other.

The structure of the Earth is highly complicated. There are many layers of rocks, and many of them are solid. The outer core layer is hot, but it is also a large mass of liquid. Rock that was once solid has melted under this pressure. The solid inner core layer is just as hot, but the pressure from the outer core is sufficient to change the inner core to become solid. As a result, the outer layers are solid and the interior layers are liquid.

The Earth’s structure is divided into four layers: the mantle, the outer core, and the inner core. Each layer has a unique physical and chemical composition and impacts life on Earth’s surface. The mantle is the only planet known to contain life. Its ozone layer has a large magnetic field and is responsible for the sun’s magnetic field. The inner core is the most important component of the earth’s surface.

The mantle is 3,000 kilometers thick and starts about 30 kilometers below the surface of the planet. The mantle contains silicon, iron, and magnesium. It is dense, and more slowly circulates than the layer beneath. The temperature of the mantle is at the melting point of rock, resulting in partially melted rock. It is thought that the mantle is the weakest part of the Earth’s mantle, and the tectonic plates slide over it.