The layers of Earth's atmosphere are separated by which of the following?

cloud bands
changes in temperature trends
sudden differences in air pressure

Layers in Earth's atmosphere are defined as regions in which _____.

air mixes together
planes cruise due to jet stream currents
the temperature of the air remains the same

In which layers does the temperature of the atmosphere increase with altitude? Select all that apply.
troposphere
stratosphere
mesosphere
thermosphere
exosphere