from the cce edition of longman vistas social studies book,what is the answer of the question 'how are alternate days and nights caused by the rotation of the earth? (G1.)'
The following points may help you":
a. The earth is inclined at an angle of 23.5 Degrees from the vertical and rotates around the sun.
b. Being spherical in shape , half portion of the earth receives sun light which thus experiences day and the other half experiences night.
c. It is the circle of illumination which divides day and night on the earth,