Earth is a spherical planet, which is composed of three layers. The core, mantle, and crust are the three layers of Earth that differ based on chemical properties and the asthenosphere.
The correct options are:
- by their chemical composition
- by their asthenosphere
The Earth's layers can be defined chemically or mechanically.
In the chemical process, the composition and properties of the different layers of the Earth are studied. The core, mantle, and crust differ in chemical composition, mechanical properties, and other characteristics.
The asthenosphere is defined as the region of Earth's mantle, which is situated underneath the lithosphere. It is believed to be much hotter and fluid than the lithosphere. It is the lubricating layer and makes up 84% of the Earth's volume.
Therefore, chemical composition and asthenosphere can be used to determine Earth's layers.
To know more about Earth's layers, refer to the following link:
https://brainly.com/question/2961831
