The main layer of the Earth's atmosphere responsible for weather is the troposphere. This layer extends from the Earth's surface up to about 8 to 15 kilometers (5 to 9 miles) and contains approximately 75% of the atmosphere's mass. Within the troposphere, temperature decreases with altitude, and it is where most atmospheric phenomena, such as clouds, precipitation, and storms, occur. Changes in the troposphere are directly linked to weather patterns that influence climate and human activities.