A. Sputnik I.
- Which is the thinnest earth layer?
- The highest part of earth is?
- What is the most important effect of the moon on earth?
- When the Earth is closest to the Sun, it is called?
- How many hemispheres does earth have?
- Ratio between oceans and earth by area is?
- Lowest part of the earth is?
- Where is the deepest point in the earth’s crust?
- The lowest part of earth is?
- The deepest part of earth is ?
- What is the name of the central part of the earth?
- The Hardest substance available on Earth is?