The lower layer of the atmosphere gets heated up by the process of _______________
A. Conduction
B. Convection
C. Advection
D. None of these

Hint: The atmosphere is defined as the envelope of air and other suspended particles that surround the Earth and other planets. The atmosphere of the Earth consists of different layers.

Complete answer:The troposphere which is the lowest layer of the atmosphere receives the latent heat from below, besides this, it also gets heat in the form of long-wave radiation, and sensible heat. The temperature of the troposphere generally decreases as the altitude increases. The rate at which the temperature decreases is called the Environmental Lapse Rate or ELR. This is nothing but the difference in the temperature between the surface of the earth and the troposphere divided by the height. The ELR assumes that the air is perfectly still and there is no mixing of the air due to vertical convection

Hence, it can be said that the troposphere gets heated up by conduction and the correct answer is option A.

Note:Each layer of the atmosphere has a different name. The lowest layer of the atmosphere is called the troposphere, which is followed by the stratosphere, then the mesosphere, ionosphere or the thermosphere, and finally the Exosphere. The troposphere is up to 12 km which is followed by the stratosphere up to 50 km. the next one, i.e. the mesosphere ranges up to 80 km, the ionosphere up to 700 km, and finally the exosphere up to 10000 km.