Backyard Salinity Map

📋 What You'll Need

• •3 small plates or saucers
• •Water samples (tap, canal, ocean)
• •Notebook and pen
• •Phone for photos

👣 Step by Step

1. 1Collect three water samples — one from a tap, one from a canal, one from the ocean.
2. 2Pour the same amount of each sample onto a separate plate.
3. 3Place all three plates in the sun (or a warm, dry spot).
4. 4Wait for the water to evaporate completely.
5. 5Look at what's left behind on each plate.
6. 6Record what you see and mark where each sample came from on a simple map.

🔍 What to Observe

• •Which plate left the most residue?
• •Which plate was almost clean?
• •Why is the lagoon called 'brackish'?