- The crust forms 0.5 percentage of the volume of the earth.
- At the latitude of 45°, the earth spins on its axis at the rate of 1,120 km/hr.
- It is 6 months long day in the northern polar region and 6 months long night in the southern polar region because earth is inclined towards its orbital plane.
- “Green House Effect” means trapping of solar energy due to atmospheric carbon dioxide (CO2 ).
- Spring tides occur on new moon and full moon days because on these days sun, moon and earth are in the straight line.
- The International Date Line is an imaginary line extending from pole to pole along the places on the earth’s surface and lies along the 180° meridian.
- The earth revolves around the sun in an elliptical orbit. Its speed is greatest when it is closest to the sun.