the lowest layer of the atmosphere - where weather occurs

The lowest layer of the atmosphere where weather occurs is called the Troposphere. Here's a step by step explanation:

1. The Earth's atmosphere is divided into five main layers: the Exosphere, Thermosphere, Mesosphere, Stratosphere, and Troposphere.

2. The Troposphere is the lowest layer of the Earth's atmosphere.

3. It extends from the Earth's surface up to about 8 kilometers at the poles and about 17 kilometers at the equator.

4. Most of the mass (about 75-80%) of the atmosphere is in the Troposphere. Most types of clouds are found in the Troposphere, and almost all weather occurs within this layer.

5. The Troposphere is heated from below by the Earth's surface. This heating can cause convection, which is the process that drives weather.

6. As you go higher in the Troposphere, the temperature decreases. This is known as the lapse rate.

7. The boundary between the Troposphere and the next layer, the Stratosphere, is called the Tropopause. Above this level, weather as we know it does not occur.