As you move deeper into the Earth's surface, both temperature and pressure increase. This is because the Earth is a hot, dense sphere, and the deeper you go, the closer you get to the hot core. The pressure also increases because the weight of the rock and soil above you increases as you go deeper.

Temperature

The temperature at the Earth's surface varies depending on the location and time of day. However, the average surface temperature is about 15 degrees Celsius (59 degrees Fahrenheit). The temperature then increases with depth, at a rate of about 25 degrees Celsius per kilometer (72 degrees Fahrenheit per mile). This means that at a depth of 1 kilometer, the temperature is about 40 degrees Celsius (104 degrees Fahrenheit). At a depth of 10 kilometers, the temperature is about 250 degrees Celsius (482 degrees Fahrenheit). And at the center of the Earth, the temperature is about 5,700 degrees Celsius (10,232 degrees Fahrenheit).

Pressure

The pressure at the Earth's surface is about 1 atmosphere (101 kilopascals). The pressure then increases with depth, at a rate of about 1 atmosphere per kilometer (101 kilopascals per mile). This means that at a depth of 1 kilometer, the pressure is about 2 atmospheres (202 kilopascals). At a depth of 10 kilometers, the pressure is about 11 atmospheres (1,010 kilopascals). And at the center of the Earth, the pressure is about 3,600,000 atmospheres (360,000,000 kilopascals).

The Effects of Temperature and Pressure on Rocks

The high temperature and pressure deep within the Earth can have a significant impact on the rocks there. The high temperature can cause the rocks to melt, forming magma. The high pressure can cause the rocks to become denser and more compact. And the combination of high temperature and pressure can cause the rocks to change their chemical composition.

The Earth's Layers

The Earth is divided into several layers, based on their composition and physical properties. The outermost layer is the crust, which is made up of solid rock. The next layer is the mantle, which is made up of mostly solid rock, but also includes some molten rock. The innermost layer is the core, which is made up of mostly liquid iron and nickel.

The temperature and pressure increase with depth in each of the Earth's layers. The crust is the coolest and least dense layer, while the core is the hottest and most dense layer.