Which among the following is the highest layer of atmosphere when measured from the sea level?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Exosphere
The atmosphere is made of five layers, from the sea level upwards:
Troposphere — the lowest layer, up to about 13 km on average (about 8 km at the poles and 18 km at the equator); all weather happens here
Stratosphere — up to about 50 km; it holds the ozone layer
Mesosphere — up to about 80 km; meteors burn up here
Thermosphere (with the ionosphere) — from about 80 km to 400 km; it reflects radio waves
Exosphere — the uppermost layer, where the air is so thin that it fades into space