Science 2nd grade | UNIT 3: Changing materials 3.5 Why is the sea salty?
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The sea is salty. Where does the salt come from?
People can get salt from the sea and from rocks under the ground.
The hot Sun is used to dry up pools of seawater. The salt is left behind.
Salt is dug from rocks under the ground.
Activity 3.5 (Dissolving materials in water)
You will need: salt - water - a beaker - a spoon - other materials to test
What do you think will happen when Tara pours salt into the water?
Try it. Stir the water. What do you see?
We say the salt dissolves.
Can you dissolve more salt into the water?
Now try to dissolve some other materials. First predict which ones will dissolve and which will not.
How will you measure the amount of material you add to make sure the test is fair?
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