How can earth's layers be defined? (two answers)
by their amounts of land area
by their physical properties(this)
by their asthenospheres
by their chemical compositions(this)
by their proximities to the core
the chemical one is right but im not sure about the second option.
How is this biology?
It isn't biology. This is earth science.
=(
The second option, "by their physical properties," is indeed one of the ways to define Earth's layers. Here is an explanation of how to define Earth's layers based on their physical properties:
1. Crust: The outermost layer of the Earth, ranging in thickness from about 5 to 70 kilometers, depending on location. It is composed mostly of solid rock and is further divided into two types: continental crust, which is thicker and less dense, and oceanic crust, which is thinner and more dense.
2. Mantle: The layer between the crust and the core, extending to a depth of approximately 2,900 kilometers. The mantle is composed of denser rocks, and its physical properties include high temperatures and slow but continuous convection currents.
3. Core: The central part of the Earth, divided into two distinct layers: the outer core and the inner core. The outer core is composed of liquid molten iron and is about 2,300 kilometers thick. The inner core, in contrast, is solid due to higher pressure, even though it is hotter. It is composed mainly of iron and nickel.
So, one way to define Earth's layers is by their physical properties, such as composition (solid vs. liquid), temperature, and density.