Earth is the third planet from the Sun in our solar system and the only known planet to support life. It is a dynamic and complex system composed of various layers that make up its structure. These layers can be broadly categorized into the crust, mantle, outer core, and inner core.

1. **Crust:** The Earth's crust is the outermost solid layer and is relatively thin compared to the other layers. It consists of solid rock and is divided into continental crust (under continents) and oceanic crust (under oceans). The crust is where we find landforms such as mountains, valleys, and plains.

2. **Mantle:** Beneath the crust lies the mantle, which is a thick layer composed of semi-solid rock. The mantle is further divided into the upper mantle and lower mantle. The movement of the mantle's semi-solid rock is responsible for plate tectonics, which drives processes like earthquakes and volcanic activity.

3..''It is called outer Core''.It surrounds the Earth's solid inner core and is responsible for generating Earth's magnetic field through the movement of molten metal.

4. **Inner Core:** At the center of the Earth is the inner core, which is a solid sphere primarily made of iron and nickel.

Understanding the structure of Earth's layers helps scientists study geological processes, seismic activity, and the planet's magnetic field. It also provides valuable insights into Earth's history and evolution over billions of years.