EVERYDAY SCIENCE

Detailed explanation-1: -The structure of the earth is divided into four major components: the crust, the mantle, the outer core, and the inner core .

Detailed explanation-2: -Starting at the center, Earth is composed of four distinct layers. They are, from deepest to shallowest, the inner core, the outer core, the mantle and the crust. Except for the crust, no one has ever explored these layers in person. In fact, the deepest humans have ever drilled is just over 12 kilometers (7.6 miles).

Detailed explanation-3: -Each layer has a unique density (density = mass/volume). Scientists believe that all planets formed on the basis of gravity. Therefore, the layering of Earth is a result of gravitational pull. The densest layer (inner core) is at the center and the least dense layer (crust) is the outermost layer.

Detailed explanation-4: -There is evidence that the materials within the earth form distinct layers, each with a different density. Most of this evidence comes from observations of seismic waves, the vibrations generated by earthquakes or explosions.

Detailed explanation-5: -Earth’s atmosphere has five major and several secondary layers. From lowest to highest, the major layers are the troposphere, stratosphere, mesosphere, thermosphere and exosphere.