Hemisphere is the exact half of a sphere. When a plane cuts across a sphere at its center, it forms two hemispheres. Surface area of a hemisphere of radius r is given by 2pr2. Volume of a hemisphere of radius r is given by 2/3pr3.
Falling dreams also often reflect a sense of failure or inferiority in some circumstance or situation. It may be the fear of failing in your job/school, loss of status, or failure in love. You feel shameful and a lost sense of self-esteem You are unable to keep up with the status quo and feel that you don't measure up.
To dream of an abyss, signifies an obstacle that you need to overcome in your life. It may be creating anxiety for you. You are afraid and/or uncertain as to what you will discover about yourself and your hidden feelings and fears. To dream that you are falling into an abyss, symbolizes the depths of your unconscious.