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The troposhere is the lowest layer of the Earth's atmosphere and the thermosphere is the second, above the mesosphere and below the exosphere. 
Thermosphere is the largest of all the layers. It is within the thermosphere that ultraradiation causes ionization. 
The troposhere is where 99% of the water vapor and aerosols are found. It is denser than the layers above it because of the weight compressing it. The troposphere as well contains approximately 75% of the mass of the atmosphere. Most of the world's weather takes place in the troposhere.

As the statement says Thermosphere and Troposphere, both are layers of the atmosphere.

The atmosphere comprises of different layers which are Troposphere, Stratosphere, Mesosphere, Thermosphere, Exosphere and Magnetosphere.

Thermosphere:

this layer of the atmosphere lies above the mesosphere. in this layer the temperature increases as we move upwards. The UV rays and X-rays from the sun are the major reason of increase in the temperature.

Troposphere:

It is the lowest part of the atmosphere. In this region the temperature decreases as we move upwards. The temperature in the Troposphere decreases by 6.5°C per Km.

To Know more about Atmosphere

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