| In which trade system goods are exchanged without the use of money |
| Barter system |
South Africa(it is about 4 km deep)
world Environment day is observed on
5 June
How much is the radius of the earth
6371 km
The crust forms how much per cent of the volume of the earth
0.5 % (16 % consists of the mantle and 83 % makes the core)
How much energy does Earth receive from sun's total solar output
1/2,000,000,000 (one two—billionth)
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