Question

1. Radio waves transmitted from the earth are reflected back to the earth in _________
a. troposphere b. stratosphere c. mesosphere d. thermosphere
2. The ozone layer is a part of ______
a. stratosphere b. troposphere c. thermosphere d. mesosphere
3. The troposphere has the largest concentration of _________
a. oxygen b. nitrogen c. water vapour d. atom
4. _______, a trillion- ton iceberg, has broken off from Antarctica's Lasren C ice shelf.
a. A-68 b. A-69 c. A-70 d. A-67
5. The mesosphere extends up to a height of _________ km
a. 80 b. 90 c. 70 d. 75​

Answer 1

Answer:

1. Troposphere
2. Mesosphere
3. oxygen
4. A-70
5. 80