ATMOSPHERE BASICS
The Invisible Blanket
This gas makes up about 78% of Earth's atmosphere. What is it?
Nitrogen
The Shield
Earth has a natural atmospheric “shield” that absorbs much of the Sun's harmful UV radiation. What is it?
The ozone layer
Carbon dioxide, methane, and water vapor can absorb and re-emit infrared radiation. What atmospheric process does this describe?
The greenhouse effect.
A factory releases substances into the atmosphere that can harm living organisms or the environment. What general term describes this problem?
Air pollution / atmospheric pollution.
Which Layer?
You look outside and see dark clouds, rain, and strong winds. Which atmospheric layer are you most likely observing?
Troposphere.
A scientist samples Earth's atmosphere. About 21% of the sample is this gas, which many organisms need for respiration.
Oxygen
Location, Location, Location!
Ozone is found throughout the atmosphere, but the protective ozone layer is mainly located in which layer?
The stratosphere.
Helpful or Harmful?
True or false: Without the natural greenhouse effect, Earth would be much colder.
The natural greenhouse effect helps keep Earth warm enough to support life.
Human Health
Give one possible way air pollution can affect human health
It can irritate or damage the respiratory system and can contribute to breathing problems.
Mystery Gas
Scientists find that a gas in the atmosphere absorbs infrared radiation and contributes to warming. Is this gas acting as a greenhouse gas or as the ozone layer?
Greenhouse gas.
Where Weather Happens
A student says, “Clouds, rain, and most weather happen in the highest layer of the atmosphere.” What is wrong with this statement?
Most weather occurs in the troposphere , the lowest layer of the atmosphere.
Too Much UV
If the protective ozone layer became significantly thinner, would more or less UV radiation reach Earth's surface?
More UV radiation would reach Earth's surface.
Too Much of a Good Thing?
Why can increasing concentrations of greenhouse gases lead to warming?
More greenhouse gases can cause more outgoing infrared radiation to be absorbed and re-emitted, increasing the amount of heat retained in the atmosphere
Environmental Impact
A pollutant released into the atmosphere later returns to Earth's surface and damages ecosystems. Give one possible environmental consequence.
Possible answers include acid rain, damage to plants, water/soil contamination, or harm to ecosystems.
The Missing Trees
A region loses a large portion of its forest. Years later, atmospheric CO₂ has increased. Give one explanation for the connection.
There are fewer trees removing CO₂ through photosynthesis, and/or carbon stored in vegetation is released when trees are burned or decomposed.
The Layer Challenge
Starting at Earth's surface, put these in the correct order:
Mesosphere – Troposphere – Thermosphere – Stratosphere – Exosphere
Troposphere → Stratosphere → Mesosphere → Thermosphere → Exosphere
Connect the Dots
Explain the connection between the ozone layer and human health.
The ozone layer absorbs harmful UV radiation, helping protect humans from excessive UV exposure and its associated health effects, such as skin and eye damage.
The Century Clue
Scientists observe that Earth's average temperature has increased over a long period while greenhouse gas concentrations have also increased. What atmospheric process could help explain this pattern?
An enhanced greenhouse effect caused by increased greenhouse gases.
Follow the Pollution
A pollutant is released from a factory far from a forest. Later, the forest is affected. Why doesn't pollution necessarily stay where it was released?
Atmospheric pollutants can be transported by wind and air currents to other locations.
Correlation ≠ Causation
Scientists observe that industrial activity and global temperatures have both increased over time. Why shouldn't they immediately conclude that one observation alone proves the other caused it?
Because correlation does not automatically prove causation. Scientists need additional evidence and must consider other factors.
Think Like a Scientist
A mountain climber and a pilot are both traveling through the atmosphere. The climber is much closer to the layer where most weather occurs. Which layer is this, and why is it important for life?
The troposphere. It contains most of the atmosphere's air and water vapor, and it is where most weather occurs.
Spot the Mistake
A student writes:“The ozone layer keeps Earth warm by trapping heat.” What concept is the student confusing with ozone?
The greenhouse effect. Greenhouse gases trap heat, while stratospheric ozone primarily protects Earth from harmful UV radiation.
The Forest Connection
A forest is cleared and burned. Explain two ways this could contribute to increasing atmospheric carbon dioxide.
Cause or Effect?
A student says:
“A factory releases pollution, so every environmental change in the area must have been caused by the factory.”
What's wrong with this reasoning?
One observation does not prove causation. Other factors could contribute, and scientists need additional evidence and investigation to establish a causal relationship.
FINAL JEOPARDY 🏆
A student says:
“The ozone layer and greenhouse effect are basically the same thing because they both involve gases in the atmosphere.”
Give two reasons why this statement is incorrect.