Sky, Pressure & the Journey of Water: A 5-Day Earth Science Unit

Overview & Key Learning Objectives

In this five-day unit, your child will investigate how air pressure, moving air, and water’s changes of state shape weather. Through simple observations, models, and a short weather forecast, they will connect the water cycle to everyday conditions in the sky.

Explain that air pressure is the force of air pushing on surfaces and that it generally decreases with altitude.
Describe how differences in air pressure help drive wind, with air generally moving from higher toward lower pressure.
Connect rising air, cooling, condensation, and cloud formation.
Identify evaporation, condensation, precipitation, and collection or runoff as parts of the water cycle.
Use observations and evidence to explain weather patterns and make a simple forecast.

Household Supply Checklist

5-Day Daily Breakdown

Day 1: Air All Around Us—Introducing Air Pressure

Teacher Script: We cannot see air, but air is matter, and it takes up space and pushes on things around us. That push is called air pressure. Today we’ll make a simple instrument that can help us notice when pressure changes, even though it won’t give us an official weather-station measurement. Scientists learn a lot by making careful observations over time.

Hands-on Activity: Make a simple pressure indicator

Stretch a balloon piece tightly over the opening of a clear cup or jar, securing it with a rubber band. Ask an adult to help if needed.
Tape one end of a straw to the center of the balloon covering. Let the other end point outward like a needle.
Place the jar on a steady surface and tape a paper scale behind the straw’s tip. Mark the starting position.
Check the straw at the same time later today, and again on the next two days. Record its position and the weather.
Discuss: the device shows relative changes, not the exact air pressure. Changes in pressure inside the jar, temperature, or how tightly the balloon is stretched can affect it.

Adaptation Note: A child who enjoys drawing can decorate and label the instrument; a child who prefers numbers can keep a simple measurement table. Invite a younger sibling to point to the straw’s position while your child records it.

Day 2: Pressure Patterns, Wind & Weather

Teacher Script: Air does not always press with the same strength everywhere. When there is a pressure difference, air tends to move from a higher-pressure area toward a lower-pressure area, and that movement is wind. Rising air in a low-pressure area often cools and can help clouds form; sinking air in a high-pressure area often makes cloud formation less likely. These are useful patterns, but real weather also depends on moisture, temperature, and other conditions.

Hands-on Activity: Build and interpret a pressure map

On paper, draw two large circles labeled High Pressure and Low Pressure.
Draw arrows from the high-pressure circle toward the low-pressure circle to model the general direction air moves.
Add arrows curving around each area as a reminder that winds can curve because Earth rotates. Keep this as a simple model, not a map of a specific storm.
Label the low-pressure area “air often rises; clouds may form” and the high-pressure area “air often sinks; skies may be clearer.”
Check your pressure indicator and record its position. If available, compare your observation with a local weather report.

Adaptation Note: If drawing maps feels difficult, provide a pre-drawn outline or use small paper arrows that can be moved. An older sibling can add a compass rose or explain why actual wind patterns are more complex.

Day 3: The Water Cycle in a Bag

Teacher Script: Water is always moving through the environment, changing location and sometimes changing state. Sunlight provides energy for evaporation, when liquid water becomes water vapor. Water vapor can cool and condense into liquid droplets, which may gather into clouds and later fall as precipitation. Let’s make a small model and look for evidence of those changes.

Hands-on Activity: Model the water cycle

Pour a small amount of water into a clear zip-top bag.
Draw a sun, clouds, and ground on the outside of the bag. Label the water at the bottom collection.
Seal the bag and tape it to a sunny window or another warm, bright place.
Check the bag after a few hours and again the next day. Look for water droplets on the inside and drops that run back down.
Draw what you observe and label where evaporation and condensation are represented. Explain that the bag models parts of the cycle, not the entire global water cycle.

Adaptation Note: A child who likes hands-on exploration can sketch each check; a child who prefers clear expectations can use a two-column “I notice / I think” chart. Help younger siblings point out droplets without opening the bag.

Day 4: Cooling Air, Condensation & Clouds

Teacher Script: Clouds form when moist air rises, expands, and cools enough for water vapor to condense into tiny liquid droplets or ice crystals. A cold surface can also reveal condensation: water vapor in the air becomes liquid water on that surface. Our activity shows condensation, but a cup is not a complete cloud model. We’ll use our observations to reason about what happens in the atmosphere.

Hands-on Activity: Observe condensation

Put a few ice cubes in a clear cup or jar and leave it on a dry surface.
Before waiting, draw the outside of the cup and note whether it looks wet.
After five minutes, observe the outside without wiping it. Record where the droplets are and whether the ice or water inside has spilled.
Explain that water vapor in the surrounding air cooled at the cold cup’s surface and condensed into liquid droplets.
Connect this to clouds: in the atmosphere, air must cool enough for water vapor to condense, often onto tiny particles in the air.

Adaptation Note: If your child is unsure what to write, offer prompts such as “Before, I saw…” and “After, I noticed…”. An older sibling can help distinguish condensation on the outside from water leaking through the cup.

Day 5: Put It Together—Weather Detective

Teacher Script: Weather is the condition of the atmosphere at a particular place and time. Air pressure, wind, moisture, and temperature work together, so no single observation tells the whole story. Today you’ll combine what you learned into a short forecast and explain the water cycle’s role. A good scientist tells what the evidence shows—and what it cannot prove.

Hands-on Activity: Make a simple weather forecast

Review your pressure-indicator notes, water-cycle bag observations, and condensation drawing.
If possible, check today’s local weather report for temperature, wind, cloud cover, and precipitation. Record the source and date.
Make a one-day forecast using at least two observations or reported conditions as evidence.
Add a labeled diagram showing how water could move through evaporation, condensation, precipitation, and collection or runoff.
Share your forecast aloud and explain one limit: for example, a homemade pressure indicator is not a calibrated barometer and cannot predict weather by itself.

Adaptation Note: Let a child who enjoys performing deliver the forecast as a “weather reporter”; a quieter child can submit a written forecast or recorded audio. Invite an older sibling to ask follow-up questions about evidence and uncertainty.

5 Review / Discussion Questions

What is air pressure, and why does it generally decrease as altitude increases?
In which general direction does air move when there is a difference in pressure?
How can rising, moist air contribute to cloud formation?
What energy source helps drive evaporation in the water cycle?
What did your observations show, and what could your homemade model or instrument not tell you?

Online Learning Resources

Khan Academy — Weather and climate search — Explanations and practice for weather, atmosphere, and water-cycle concepts.
NASA Climate Kids — Kid-friendly Earth and atmosphere information from NASA.
UCAR Center for Science Education — Weather and atmospheric science learning resources.
NOAA Education — Educational resources from the U.S. National Oceanic and Atmospheric Administration.
National Geographic Kids — Articles and media about weather, Earth, and the water cycle.
Britannica Kids — Reference articles for background research.
YouTube search: air pressure and water cycle for kids — Search results for visual explanations; preview videos together and choose age-appropriate sources.

5 Engaging Assignments

Day 1 — Pressure Watch: Record the homemade indicator’s position and the weather. Turn in: a small observation table with at least two entries.
Day 2 — Wind Map: Draw and label a high-to-low-pressure map with arrows. Turn in: the labeled map and one sentence explaining the arrow direction.
Day 3 — Water Cycle Sketch: Draw the bag model and label the processes it represents. Turn in: one annotated diagram with a brief observation.
Day 4 — Condensation Report: Describe what appeared on the cold cup and explain where the droplets came from. Turn in: a short paragraph or labeled before-and-after drawing.
Day 5 — Weather Forecast: Present a one-day forecast supported by at least two observations or reported conditions. Turn in: a written forecast, audio recording, or brief presentation notes.

Big Project

Project: Make a Weather-and-Water-Cycle Field Guide

Goal: Create a one-page poster or booklet that explains how air pressure, wind, clouds, and the water cycle connect, using observations and a simple forecast.

Materials: Paper or cardboard, pencil, colored pencils or markers, ruler, your activity notes, and optional local weather information.

Milestones:

Day 1: Start an observation log. Record the pressure indicator’s starting position and the weather.
Day 2: Add a high- and low-pressure diagram with arrows showing the general direction of air movement.
Day 3: Add a labeled water-cycle diagram and one observation from the bag model.
Day 4: Add your condensation observation and explain how cooling helps water vapor become liquid droplets.
Day 5: Add a short forecast supported by evidence, then present the finished field guide to your parent.

Simple grading rubric (8 points total):

Science accuracy — 0–2 points: Explains pressure, wind, condensation, and the water cycle accurately.
Labeled diagrams — 0–2 points: Includes clear labels and arrows that match the explanations.
Use of evidence — 0–2 points: Includes observations and uses them appropriately to support the forecast.
Clarity and completion — 0–2 points: Work is organized, readable, and finished.

Pre-Test

What is air pressure?
Does air pressure generally increase or decrease as altitude increases?
Which way does air generally move when two areas have different air pressure?
What is evaporation?
What is condensation?
Name one form of precipitation.
What usually provides the energy that drives evaporation in the water cycle?

Answer Key

The force of air pushing on surfaces.
It generally decreases.
From higher pressure toward lower pressure.
The change from liquid water to water vapor.
The change from water vapor to liquid water.
Examples include rain, snow, sleet, or hail.
Energy from the Sun.

Final Test

Multiple choice: What is air pressure?
A. The speed of clouds
B. The force of air pushing on surfaces
C. The amount of rain in a storm
D. The temperature of the ground
Multiple choice: Air pressure generally does what as altitude increases?
A. Increases
B. Decreases
C. Stays exactly the same
D. Turns into wind
Short answer: In general, which direction does air move when there is a pressure difference?
Multiple choice: What is evaporation?
A. Liquid water changing into water vapor
B. Water vapor changing into liquid water
C. Water falling from clouds
D. Water freezing into ice
Short answer: What happens to moist air as it rises and cools, and how can that help form a cloud?
Multiple choice: Which process forms droplets on the outside of a cold cup?
A. Precipitation
B. Condensation
C. Runoff
D. Freezing
Short answer: Name two forms of precipitation.
Short answer: What is one reason a homemade pressure indicator should not be treated as an official weather forecast tool?
Multiple choice: Which statement best describes the water cycle?
A. Water moves through the environment and changes state.
B. Water only moves when it rains.
C. Water disappears when it evaporates.
D. Clouds are made only of water vapor.
Open-ended: Explain how air pressure, rising moist air, cooling, and the water cycle can be connected to a rainy day. Include at least three scientific terms from the unit.