What caused the early atmosphere to have carbon dioxide, water vapor and ammonia in it?

• Tsunamis

• Cyanobacteria

• Volcanoes

• Animals

What is another name for cyanobacteria?

• Blue Green Algae

• Green Stuff

• Water Goop

• General Bacteria

How did cyanobacteria help form an atmosphere that animals and people can survive in?

• Converted Oxygen to CO2 using photosynthesis

• Added more CO2 into the air

• Added more water vapor into the air

• Converted CO2 to Oxygen using photosynthesis

Is there more oxygen or nitrogen in our current atmosphere?

• Oxygen

• Nitrogen

What layer of the atmosphere is the lowest?

• Mesosphere

• Stratosphere

• Troposphere

• Thermosphere

What layer of the atmosphere is the Highest?

• Mesosphere

• Stratosphere

• Troposphere

• Thermosphere

What layer of the atmosphere is the coldest

• Mesosphere

• Stratosphere

• Troposphere

• Thermosphere

What layer of the atmosphere contains the ozone layer?

• Mesosphere

• Stratosphere

• Troposphere

• Thermosphere

As altitude increases what happens to the density of the air?

• Increases

• Decreases

What protects us from ultra violet radiation

• Greenhouse Gasses

• Thermosphere

• Mesosphere

• Ozone Layer