Atmosphere I

How much oxygen do we have in earth’s atmosphere?

• 78%

• 20.9%

• 33%

• 40.2%

What is the percentage of nitrogen in Earth's atmosphere?

• 1%
• 21%
• 78%
• 90%

Where does our Earth's weather occur?

• In the Troposphere

• In the Stratosphere

• In the Mesosphere

• In the Exosphere

Which layer of the atmosphere is densest layer?

• mesosphere

• stratosphere

• thermosphere

• troposphere

Oxygen was first added to the atmosphere by organisms called _________________.

• phytoplankton

• nitrogen fixing bacteria

• VOCs

• phosphorescent bacteria

The _______________ is the warmest layer of the atmosphere because it absorbs high energy solar radiation. This produces electrically charged ions that create auroras.

• troposphere

• stratosphere

• thermosphere

• mesosphere

Which layer of the atmosphere helps us by burning up incoming meteors?

• exosphere

• troposphere

• mesosphere

• thermosphere

What is the function of the ozone layer?

• to allow UV rays to get to Earth
• to block UV rays from getting to Earth
• To keep oxygen in
• to allow meteors to get to Earth

Which layer is the outermost layer?

• troposphere
• thermosphere
• exosphere
• mesosphere

How did scientists determine where the layers of the atmosphere are divided?

• a change in elements

• a change in compounds

• a change in temperature

• a change in ozone