The image below shows a mineral specimen of quartz.What is the term for the smoothly curving,clamshell-shaped surface on the sample below? 
Definitions:
Physical Attractiveness
Refers to the degree to which a person's physical traits are considered aesthetically pleasing or beautiful by others.
Peak Experiences
Times when people can transcend themselves and feel one with the world.
Positive Psychology
A branch of psychology focused on the study of positive human functioning and flourishing on multiple levels, including the biological, personal, relational, institutional, cultural, and global dimensions of life.
Approach Vs. Avoidance
A psychological framework describing an individual's inclination to move towards positive stimuli or away from negative stimuli.
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