ERT-4.D—Describe the structure and composition of the Earth’s atmosphere

Describe the structure and composition of the Earth’s atmosphere.

• The atmosphere is made up of major gases, each with its own relative abundance.
• The layers of the atmosphere are based on temperature gradients and include the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.
• Enduring understanding ERT-4: Earth’s systems interact, resulting in a state of balance over time.