Which of the following would represent the thickness of the lower layer of the atmosphere,if the Earth were the size of an apple? 

A)  the skin 
B)  the white part of the apple we eat 
C)  the whole apple 
D)  the core

Lower Layer

Refers to the bottom or underneath sections in a stratified structure, such as atmospheric layers, soil profiles, or bodies of water.

Atmosphere

The layer of gases surrounding a planet or other celestial body, held in place by gravity.

Earth

The third planet from the Sun, uniquely characterized by its vast oceans, breathable atmosphere, and diverse ecosystems supporting life.