Which branch of science provides the most proof that the earth is approximately 4.6 billion years old? justify your response in two or more complete sentences

Astronomy is a branch of science that studies the Earth and the universe.  Since the age of the Earth will be based on how it starts, or how the universe starts, astronomy surely has the most proof that Earth is approximately 4.6 billion years old.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.