WITH 100% CORRECT ANSWERS
What are the percentages of gases in pure, dry air? - ✔✔78% nitrogen
21% oxygen
1% other gases
What percent is water vapor in the atmosphere? - ✔✔0-5% by volume
What is the troposphere? - ✔✔Layer adjacent to the Earth's surface
Where does all weather occur? - ✔✔Troposphere
In the troposhpere, what happens to the temperature with an increase in
altitude? - ✔✔Temperature decreases
What are the winds like in the troposphere? - ✔✔Winds are light near the
Earths surface and increase with altitude
Where is the troposphere? (height) - ✔✔Average height of 36000 MSL
What is the moisture content in the troposphere? - ✔✔Large amounts of
moisture and condensation
Is the troposphere higher in the summer or in the winter? - ✔✔Higher in the
summer. Think that the air is heating up and rising the troposphere
Page 1 of 25
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
,What is the tropopause? - ✔✔Transition zone between the troposphere and
stratosphere
What happens to temperature with an increase in altitude in the tropopause?
Decrease? - ✔✔Constant
Constant
Where do the strongest winds occur? - ✔✔In the tropopause
What is atmospheric pressure? What is atmospheric pressure also known as? -
✔✔Pressure exerted on a surface by the atmosphere due to the weight of the
column of air directly above that surface
As altitude increases, what happens to pressure? - ✔✔Decreases always
What are the two standard units of pressure? - ✔✔Inches of mercury (in-Hg)
Millibars (mb)
What is station pressure? - ✔✔Atmospheric pressure measured directly at an
airfield
Which is greater, station pressure or sea level pressure? - ✔✔Station
pressure...... stations wont be in the sea
What is Sea Level Pressure? - ✔✔Pressure that would be measured if the station
was at MSL
Page 2 of 25
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.
, How do stations report pressure regardless of location? - ✔✔In Sea Level
Pressure
What is Atmospheric circulation? - ✔✔Earth is constantly heated and cooled as
it rotates. This causes ascending and descending air
What are the two ways atmospheric circulation moves air? - ✔✔Ascending and
descending currents
What causes Atmospheric circulation? - ✔✔Wind trying to go from high
pressure to low pressure. Due to the Coriolis Force
What are Pressure Gradients? - ✔✔Spacing of isobars that represent a change in
pressure over a horizontal distance.
When is a Pressure Gradient Force (PGF) strong? - ✔✔When isobars are close
together
What is the initiating force for all winds? - ✔✔Pressure Gradient Force
What pressure gradient force is associated with slower winds? - ✔✔Wide
spaced PGF
What is standard atmosphere? - ✔✔Standard day at sea level conditions
29.92 in-Hg
15 C
Page 3 of 25
©NINJANERD 2025/2026. YEAR PUBLISHED 2025.