Sky Sculptors Reading Passage
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Grade 6 Science • Informational Reading
Sky Sculptors: How Clouds Are Made
How invisible water, warm air, and tiny specks of dust build floating wonders in the sky.
Lexile 750L
The Invisible Ascent
On any sunny day, warm sunlight hits oceans, lakes, and soil. This heat turns liquid water into an invisible gas called water vapor. Warm air is lighter than cool air, so it floats upward into the troposphere—the lowest layer of our atmosphere.
As this warm air rises higher, air pressure drops. This allows the rising air to expand and cool in a process called adiabatic cooling. Cool air cannot hold as much water vapor as warm air. Soon, the air cools to its dew point. This is the temperature where the air is completely full of water vapor.
To form a cloud, water vapor needs something to grab onto. It clings to tiny floating specks called condensation nuclei. These are microscopic particles of dust, smoke ash, and ocean salt. Trillions of water droplets cling to these specks, creating a visible cloud.
The Three Great Cloud Families
Scientists group clouds by their height and shape. The three main families are cirrus, stratus, and cumulus.
Cirrus clouds live highest in the sky, more than 20,000 feet up. High air is bitterly cold, so cirrus clouds are made of tiny ice crystals instead of liquid water drops. Fast winds stretch them into wispy, white streaks that look like horse tails.
Stratus clouds hang low to the ground. They form flat, gray sheets that can stretch across hundreds of miles like a giant blanket. Stratus clouds usually bring dull, overcast skies and steady light drizzle.
In contrast, cumulus clouds are the fluffy, cotton-like clouds we see on pleasant sunny days. Pockets of rising warm air push their bottoms flat while their tops puff up like cauliflowers. They usually signal calm, fair weather.
Storm Titans: The Cumulonimbus
On very hot afternoons, friendly cumulus clouds can grow rapidly. Strong updrafts push warm, moist air straight up. As water vapor condenses into water drops, it releases stored energy called latent heat. This heat warms the air and accelerates the updraft like an invisible rocket.
The cloud becomes a giant cumulonimbus cloud. These storm titans can reach ten miles high! When the top hits the stratosphere, the air stops rising. The summit spreads flat into a wide anvil head, bringing lightning, downpours, and hail.
Living Barometers of the Sky
Long before weather apps, farmers and sailors watched clouds like living barometers. Spotting thin cirrus clouds drifting eastward often warned that rain would arrive in twenty-four hours. By reading cloud shapes, anyone can predict changing weather patterns.
Meteorologist's Pocket Lexicon Key Scientific Concepts
Condensation Nuclei: Tiny airborne specks of dust, salt, or ash that water vapor clings to when condensing.
Dew Point: The exact temperature where air cools enough to become completely full of water vapor.
Latent Heat: Heat energy released into the surrounding air when water vapor turns back into liquid water drops.
Reading Comprehension Assessment
Carefully read each question based on "Sky Sculptors." Darken the bubble corresponding to the single best answer.
Text Evidence • Analysis 10 Questions • 10 Points
Part 1: Literal Comprehension (Direct Evidence)
Answers are directly stated in the reading passage.
1. What tiny specks must water vapor cling to before it can form cloud droplets?
A) Pure oxygen gas bubbles
B) Condensation nuclei like dust, ash, or sea salt
C) Heavy ozone crystals from high above
D) Large ice blocks drifting in the jet stream
2. Which cloud type forms highest in the sky and is made entirely of ice crystals?
A) Cumulus
B) Stratus
C) Cirrus
D) Fog
3. According to the text, what triggers adiabatic cooling as warm air ascends?
A) Air pressure decreases, allowing air to expand and cool
B) Sunlight reflects off surrounding glaciers
C) Ocean waves pull cool water vapor downward
D) Strong winds squeeze the rising air together
4. Why does a cumulonimbus cloud develop a flat, wide anvil shape at its peak?
A) Ocean winds blow the base of the cloud away
B) It hits the stratosphere where air stops rising
C) Hailstones melt before reaching high altitudes
D) The sun dries out the top edges of the cloud
5. Which cloud type creates low, uniform gray sheets that bring steady light drizzle?
A) Cumulonimbus
B) High-altitude cirrus plumes
C) Stratus
D) Puffy fair-weather cumulus
Part 2: Inferential Comprehension (Deep Thinking)
Deduce the correct response using clues and context.
6. If you observe small morning cumulus clouds swelling rapidly into tall columns by 2:00 PM, what can you infer?
A) A long drought will continue all afternoon
B) Strong updrafts are turning them into thunderstorms
C) The air high above is warming rapidly
D) The clouds will disappear before evening
7. Why are cirrus clouds unable to produce heavy, drenching rain showers on the ground?
A) They are made of thin, scattered ice crystals high up
B) They only appear during the middle of the night
C) Their water droplets are stuck to the ground
D) They are too close to Earth's warm surface
8. Why does the release of latent heat act like an "invisible rocket" inside a storm cloud?
A) It cools the cloud center, causing air to sink
B) It pushes surrounding clouds out of the way
C) It keeps rising air warm, powering updrafts upward
D) It creates sparks that blow the cloud apart
9. Why did sailors and farmers call clouds "living barometers"?
A) Clouds show people the exact minute of the day
B) Cloud shapes reveal shifts in pressure and incoming weather
C) Barometers are manufactured inside cloud layers
D) Clouds change color whenever seawater warms up
10. Which statement best explains the author's main purpose in this passage?
A) To explain how clouds form and describe main cloud types
B) To persuade readers to stay indoors during bad weather
C) To argue that modern weather radar is not useful
D) To tell an imaginary story about flying through storms
Student Response Matrix (Darken one bubble per question) Record final answers clearly
Q1
( A ) ( B ) ( C ) ( D )
Q2
( A ) ( B ) ( C ) ( D )
Q3
( A ) ( B ) ( C ) ( D )
Q4
( A ) ( B ) ( C ) ( D )
Q5
( A ) ( B ) ( C ) ( D )
Q6
( A ) ( B ) ( C ) ( D )
Q7
( A ) ( B ) ( C ) ( D )
Q8
( A ) ( B ) ( C ) ( D )
Q9
( A ) ( B ) ( C ) ( D )
Q10
( A ) ( B ) ( C ) ( D )
Sky Sculptors Answer Key
Teacher Resource Lexile 750L • CCSS RI.6.1 • RI.6.2 • NGSS MS-ESS2-4
Sky Sculptors • Assessment Key & Evidence Guide
10 Questions • 100% Total
Rapid-Scan Answer Strip Quickly match against student response matrix
Q1B
Q2C
Q3A
Q4B
Q5C
Q6B
Q7A
Q8C
Q9B
Q10A
Literal Comprehension • Direct Text Evidence RI.6.1
Q1. Microscopic condensation particle Ans: B
Passage Citation: "It clings to tiny floating specks called condensation nuclei. These are microscopic particles of dust, smoke ash, and ocean salt."
Distractor Note: Options A, C, and D describe gases or macro ice structures, not microscopic solid launchpads.
Q2. Cloud genus above 20,000 ft (ice crystals) Ans: C
Passage Citation: "Cirrus clouds live highest in the sky, more than 20,000 feet up... made of tiny ice crystals instead of liquid water drops."
Distractor Note: Stratus clouds reside low to ground; cumulus occupy lower-to-mid levels.
Q3. Mechanism causing adiabatic cooling Ans: A
Passage Citation: "As this warm air rises higher, air pressure drops. This allows the rising air to expand and cool in a process called adiabatic cooling."
Distractor Note: Expansion caused by dropping atmospheric pressure drives cooling.
Q4. Cause of cumulonimbus anvil shape Ans: B
Passage Citation: "When the top hits the stratosphere, the air stops rising. The summit spreads flat into a wide anvil head..."
Distractor Note: The stratosphere acts as a natural ceiling that caps vertical air movement.
Q5. Low gray sheets with light drizzle Ans: C
Passage Citation: "Stratus clouds hang low to the ground. They form flat, gray sheets... bringing dull, overcast skies and steady light drizzle."
Distractor Note: Cumulonimbus clouds bring violent downpours; cumulus bring fair sunny weather.
Inferential Analysis • Deductive Reasoning RI.6.1 • RI.6.6
Q6. Rapidly swelling afternoon cumulus Ans: B
