Question

Hel
inos
stataspher
nisod
srtat
Unscramble the letters given in the help box and fill in the blanks.
1.
extends to a height of 50 km above the troposphere.
2.
Wireless communications are possible due to the presence of
in the thermosphere.
3. The percentage of oxygen in the atmosphere is 21
while that of nitrogen 78
%.
4. The main source of heat received by the earth is
%
87
12​

Answer 1

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Answer 2

Answer:

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