What is the defining characteristic of the troposphere?

(Straight forward answers please & thank you)

My goodness! You're in big trouble if you don't know any of these answers!

Omg, are u taking Natural Hazzards at UCD? Im having trouble finding all these answers too! Such a horrible class.

The defining characteristic of the troposphere is that it is the lowest layer of Earth's atmosphere, extending from the Earth's surface to approximately 7 to 20 kilometers (4 to 12 miles) in altitude, depending on the location. This layer is characterized by decreasing temperature with increasing altitude, and it contains the majority of Earth's weather phenomena, including clouds, moisture, and most of the Earth's air mass.