ASVAB General Science Practice Test 860471

Question 2 of 5
Thermosphere

Temperatures again increase with altitude in the thermosphere which is the hottest (4,530 °F / 2,500 °C) atmospheric layer due to direct exposure to the Sun's radiation. However, the gas in this layer is highly diluted so even though the atoms of gas may be very high in temperature, there are too few of them to effectively transfer much heat.

The hottest of Earth's atmospheric layers is which of the following?

thermosphere

mesosphere

troposphere

stratosphere