What is the outermost layer of the earth called?

The outermost layer of the Earth is called the crust. This layer is the uppermost part of the Earth's structure where all living organisms, including humans, reside. It is the Earth's surface layer and plays a vital role in supporting life and forming the foundation for ecosystems and human activity.

The outermost layer of the Earth, the crust, varies in thickness, ranging from approximately 0 to 60 kilometers. It is composed of solid rock and can be categorized into two types:

• Continental Crust: Thicker and primarily made up of granite, this type forms the landmasses.
• Oceanic Crust: Thinner and denser, consisting mainly of basalt, this type lies beneath the oceans.

Below the crust are other significant layers of the Earth, including the mantle, the outer core, and the inner core. Each of these layers has distinct properties and compositions. However, the crust remains the outermost layer of the Earth, providing a protective shell over the deeper layers.

In summary, the crust, as the outermost layer of the Earth, is fundamental to the planet's geology and its ability to sustain life.