Water: Earth’s Taonga

Overview

Lesson 1 of 6 in Our Blue Planet: Water Cycle. Students locate Earth’s water, model its three states, and explain why Aotearoa New Zealand and Earth are described as “blue planets”, while recognising that not all water is usable.

Learning intentions

• WALT identify where water is found on Earth and in Aotearoa New Zealand.
• WALT name and model the three states of water.
• WALT explain why abundant water can still mean shortages.
• WALT use evidence from maps, images and station activities to communicate scientific ideas.

Success criteria

• I can name and model solid, liquid and gas.
• I can give examples of each state from Aotearoa New Zealand.
• I can explain why most water is not readily available for people to use.
• I can describe why Earth and Aotearoa New Zealand are called “blue”.

Curriculum links

• Nature of Science: gathering, interpreting and communicating evidence.
• Physical world: describing changes and properties of matter, including the states of water.
• Planet Earth and beyond: identifying Earth’s water resources and considering how natural systems affect people.
• Science capabilities: observing in context, interpreting representations, using evidence and communicating explanations.

Lesson structure (45 minutes)

1. 0–5 minutes – Retrieval challenge and hook Open with the hook and retrieval challenge. Display an image of Earth from space and ask: “If Earth has so much water, why can people ever run out?” Students individually write or draw everything they know about where water is found. Take several responses without correcting them yet.

2. 5–10 minutes – Introduce the learning Share the WALT and success criteria from the learning intentions and success criteria. Briefly explain that “blue planet” refers to the large amount of water visible from space, but most of that water is salty, frozen or difficult to access. Read or listen to the short “Our Blue Planet” text on the Blue Planet reading and recording sheet; students may read in pairs or use teacher/audio reading.

3. 10–22 minutes – Water-state station rotations Place students in nine teams of four. Teams rotate through four stations, spending approximately three minutes at each, using the water-state station instructions and recording on the water-state recording table. Stations show or discuss: ice/snow and glaciers (solid), rivers/lakes/rain (liquid), and water vapour/cloud formation or steam (gas). Students must name the state, draw a particle model, and record an Aotearoa example. At the fourth station, teams sort examples into the three states and justify one choice.

4. 22–29 minutes – Map and globe investigation Gather attention and display a globe or local map alongside the Earth and Aotearoa map prompts. Students identify oceans, the Tasman Sea, the Pacific Ocean, rivers, lakes, glaciers and rainfall areas where visible. Ask: “Which water could people use directly? Which would need treatment?” Clarify that water can be present but inaccessible, polluted, frozen or salty.

5. 29–38 minutes – Which water is usable? Teams use the scenarios on the usable-water team task and discuss whether each source is readily usable, usable after treatment, difficult to access, or not suitable for drinking. Scenarios include seawater, a clean stream, groundwater, a glacier, polluted floodwater and rainwater. Each team chooses one example and prepares a two-sentence explanation using the frame: “This water is ___ because ___. People could use it if ___.”

6. 38–43 minutes – Share and develop the explanation Invite four teams to share different examples. Use the discussion and misconception-check slides to revisit the key idea: water is abundant globally, but usable freshwater is limited and unevenly distributed. Prompt students to improve the statement “There is lots of water, so there cannot be shortages” by adding evidence.

7. 43–45 minutes – Exit check Students complete the final three prompts on the exit reflection: draw or name the three states, give one Aotearoa example, and explain one reason water shortages can occur. Collect responses to plan the next lesson on movement and change in the water cycle.

Resources

• Water: Earth’s Taonga teaching deck covering the hook, retrieval, instructions, station visuals, map prompts, discussion and exit review.
• Water: Earth’s Taonga recording sheet with reading, station table, usable-water task and exit reflection.
• Globe or classroom world map.
• Local map of Aotearoa New Zealand showing major rivers, lakes, seas and mountain areas.
• Station image cards or projected images of ice, snow, glaciers, rivers, lakes, rain, clouds and water vapour.
• Four station tables or desks, with pencils and coloured pens.
• Optional ice cube in a sealed container and clear warm-water demonstration container.
• Timer and board space for student explanations.

Assessment

• Listen for accurate identification of solid, liquid and gas during station work; question students about their particle models.
• Check team explanations for the distinction between water being present and water being readily usable.
• Use exit reflections to identify misconceptions, particularly “all water is drinkable” or “clouds are smoke”.

Differentiation

• Provide visual vocabulary cards for solid, liquid, gas, freshwater, saltwater, usable, access and display a labelled model.
• Use teacher modelling, paired or audio reading, mixed-support teams and sentence frames such as “An example of solid water in Aotearoa is ___.”
• Allow drawing, oral recording or scribing instead of extended writing; provide enlarged worksheets, reduced writing load and clear station roles for students with SEN.
• Extend confident learners by comparing freshwater availability in New Zealand with another country and justifying differences using climate, geography, population or access to infrastructure.