66.The crust forms what percentage of the volume of the earth ?

67.Tides are the highest

68.Spherical shape of the earth was suggested by 1. Pythagoras 2. Copernicus3. Aristotle 4. Aryabhattain the chrnological order.

69.The distance between the Earth and the Sun (in million kms.) is

70.Which of the following are true regarding equinoxes ? 1. They occur on March 21 st and September 23rd2. They depict equal days and equals nights on March 21st and September 23rd on all places of the earth.3. All places on the earth have equal temperature during equinoxes.