Pollution and Environmental Changes

The phenomenon causing global warming occurs primarily in this region of the atmosphere. 

• Exosphere
• Thermosphere
• Stratosphere
• Troposphere

The beneficial ozone layer is in this region of the atmosphere. 

• Troposphere
• Statosphere
• Thermosphere
• Mesosphere

Most oxygen is found in this layer of the atmosphere. 

• Troposphere
• Stratosphere
• Mesosphere
• Thermosphere

A greenhouse gas that is exclusively anthropogenic (from human activity)

• water
• carbon dioxide
• ozone
• CFCs

The most abundant nonanthropogenic (non-human activity; caused by nature) greenhouse gas

• water vapor
• ozone
• methane
• CFCs

A greenhouse gas that, in the lower troposphere, is formed by photochemical (reaction with the sun) reactions

• water vapor
• carbon dioxide
• methane
• ozone

Most often cited as what causes acid deposition (acid rain) 

• sulfur dioxide
• lead
• ozone
• carbon dioxide

Considered harmful in the troposphere but beneficial in the stratosphere     

• sulfur dioxide
• lead
• ozone
• carbon dioxide

Region where the protective ozone layer is located 

• troposphere
• stratosphere
• mesosphere
• thermosphere

Region that contains the majority of molecules in the atmosphere

• troposphere
• stratosphere
• mesosphere
• thermosphere