Environmental Studies ยท Geography

Atmospheric Structure and Ozone

1,401 Questions

Atmospheric structure and ozone layer topics examine the Earth's atmospheric layers, the impact of solar radiation, and ozone depletion mechanisms. These environmental science concepts are crucial for general awareness sections in multiple competitive examinations. Review these questions to solidify your understanding of the stratosphere, polar vortex effects, and greenhouse gases.

Earth's atmospheric layersOzone layer depletionSolar ultraviolet radiationPolar vortex effectsCarbon dioxide impactOzone-depleting substances

Atmospheric Structure and Ozone Questions

Multiple choice

21% of the atmosphere is _______________.

  1. Oxygen

  2. Nitrogen

  3. Carbon Dioxide

  4. Carbon Monoxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Earth's atmosphere is composed of approximately 78% nitrogen, 21% oxygen, and 1% other gases.

Multiple choice

Albedo is a measure of surface reflectivity. The polar albedo is important because:

  1. It reflects greenhouse gases, cooling our planet

  2. It absorbs solar radiation, which melts snow

  3. It reflects solar radiation back into space, cooling earth

  4. It absorbs greenhouse gases, pulling them out of circulation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Albedo is the reflectivity of a surface. High albedo in polar regions reflects sunlight back into space, which helps keep the Earth cool.

Multiple choice

Where does 50% of Earth's oxygen come from?

  1. freshwater

  2. oceans

  3. glaciers

  4. precipitation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Marine plants, particularly phytoplankton, are responsible for producing approximately 50 to 80 percent of the oxygen in Earth's atmosphere through photosynthesis.

Multiple choice

What is the function of the ozone layer?

  1. removes pollution from the atmosphere

  2. protects Earth from the sun's heat

  3. shields Earth from harmful solar radiation

  4. provides the oxygen needed by human life
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ozone layer in the stratosphere absorbs the majority of the sun's ultraviolet (UV) radiation. This protection is vital for life on Earth, as excessive UV exposure causes skin cancer and other biological damage.

Multiple choice

When trees are cut and burned, they release _________ which depletes the ozone layer.

  1. carbon monoxide

  2. oxygen

  3. glucose

  4. carbon dioxide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Burning trees releases carbon dioxide, a greenhouse gas. While carbon dioxide is the primary product of combustion, it is not the primary cause of ozone layer depletion, which is typically attributed to CFCs; however, in the context of this specific curriculum, carbon dioxide is the intended answer.

Multiple choice

What will the continued depletion of the ozone layer most likely cause?

  1. an increase in skin cancer among humans

  2. a decrease in atmospheric pollutants

  3. an increase in marine ecosystem stability

  4. a decrease in climatic changes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The ozone layer absorbs harmful ultraviolet radiation. Its depletion allows more UV light to reach the surface, which is a known cause of increased skin cancer rates.

Multiple choice

Why does Mars appear red?

  1. It is very hot

  2. it's distance from the Sun

  3. it has iron oxide in the soil

  4. it has sulfur dioxide in its atmosphere
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mars appears red because its surface is covered in iron oxide, commonly known as rust, which gives the planet its distinctive color.