Layers are defined by changes in a. Heat b. Density c. Temperature d. Elevation

The layers of the Earth's atmosphere, for example, are defined by changes in temperature. As you ascend in altitude, you experience distinct temperature shifts, which create varying layers such as the troposphere and stratosphere. Each layer has unique characteristics and plays a crucial role in weather patterns and climate. Density also plays a significant role in understanding how layers are organized. For instance, in the context of the Earth's interior, material becomes denser as you go deeper. This density gradient contributes to phenomena such as the formation of tectonic plates and the behavior of seismic waves during earthquakes, making it essential for geoscientists to study these aspects.