LUOA 9th grade Science FINAL
UPDATED Exam Questions and
CORRECT Answers
Most powerful substance to hold heat in atmosphere - CORRECT ANSWER- Water vapor
How does carbon get into the atmosphere? - CORRECT ANSWER- Atmospheric carbon
dioxide comes from two primary sources—natural and human activities. Natural sources of
carbon dioxide include most animals, which exhale carbon dioxide as a waste product.
Human activities that lead to carbon dioxide emissions come primarily from energy
production, including burning coal, oil, or natural gas.
Different types of greenhouse gases - CORRECT ANSWER- There are several different
types of greenhouse gases. The major ones are carbon dioxide, water vapor, methane, and
nitrous oxide.
Definition of radiation, convection, conduction - CORRECT ANSWER- Conduction is the
transfer of thermal energy through direct contact. Convection is the transfer of thermal energy
through the movement of a liquid or gas. Radiation is the transfer of thermal energy through
thermal emission.
How greenhouse gases work - CORRECT ANSWER- Solar energy absorbed at Earth's
surface is radiated back into the atmosphere as heat. As the heat makes its way through the
atmosphere and back out to space, greenhouse gases absorb much of it. Why do greenhouse
gases absorb heat? Greenhouse gases are more complex than other gas molecules in the
atmosphere, with a structure that can absorb heat. They radiate the heat back to the Earth's
surface, to another greenhouse gas molecule, or out to space.
Calculating dew point - CORRECT ANSWER- This can be expressed as a simple rule of
thumb: For every 1 °C difference in the dew point and dry bulb temperatures, the relative
humidity decreases by 5%, starting with RH = 100% when the dew point equals the dry bulb
temperature.
If air cools beyond its dew point and still does not condense, the air is said to be
______________ - CORRECT ANSWER- Supersaturated
,Water collects on dust, ash, salt, nitrate, etc. When water collects on these, they are known as:
- CORRECT ANSWER- Condensation nuclei
Latent heat is when __________, __________, and __________. (Choose 3) - CORRECT
ANSWER- 1. Energy is being released
2. There is no temperature change during a phase change
3. Energy is being absorbed
Difference between vaporization and boiling - CORRECT ANSWER- The following are the
two prime differences: Evaporation is the process of a substance in a liquid state changing to
a gaseous state due to an increase in temperature and/or pressure. Vaporization is also the
phase change from liquid to gas state but above the boiling point of the liquid.
Absolute humidity __________________ (select all that apply). - CORRECT ANSWER- -
The amount of water vapor, by mass, in each cubic unit of air-
Can be measured using several different types of mass ratios-
Is also known as the vapor density
Relative humidity is the amount of water vapor in the air, - CORRECT ANSWER- compared
with the maximum amount of water vapor that the air can contain at that temperature
For every ________ increase in temperature, twice as much water vapor can enter the
atmosphere through evaporation. - CORRECT ANSWER- 10°
The water vapor can enter the atmosphere because of what five things? - CORRECT
ANSWER- wind blowing over the surface of the water,
increased temperature of water,
decreased pressure of water,
evaporation,
and transpiration
, The maximum amount of water vapor air can contain at a particular temperature is 20 g/kg. -
CORRECT ANSWER- The formula is:relative humidity = specific humidity x 100% =
maximum capacity
Cold air does not contain much moisture. Choose all the reasons for this. - CORRECT
ANSWER- -Cold air contracts so there is no room for the moisture-Cold air is very dense-
The molecules of cold air squeezed closer together
What is one relationship between warm air and humidity? - CORRECT ANSWER- Warm air
expands, so there is a lot of room for moisture.
In order to find the relative humidity, 1st you take the __________ between the wet-bulb and
dry-bulb temperatures. ___________ the smaller number from/to the larger number. Then
find the ___________. Use the dewpoint to find the _________ humidity. - CORRECT
ANSWER- difference, subtract, dewpoint, relative
What is the lifted condensation level? - CORRECT ANSWER- The lifted condensation level
is the point of height where the dew point is the same as the surrounding temperature. Higher
clouds have more of an effect than low clouds.
Where on a cloud is where the temperature has reached its dew point? - CORRECT
ANSWER- on the bottom of the cloud
Cloud albedo forcing ___________________. (Choose 3) - CORRECT ANSWER- cools the
earth,
bounces shortwave radiation back into space,
can cause a change in the climate of the earth.
___________________. (Choose 3)
cools the earth, bounces shortwave radiation back into space, can cause a change in the
climate of the earth.
Higher clouds have more of an effect than low clouds. They let _______ energy in, but do not
give off a lot of heat because they are very _______ themselves. - CORRECT ANSWER-
heat, cold
