Problem: Which of these mixtures are heterogeneous? a. oil and water b. salt and water c. brass (an alloy of copper and zinc) d. granite (a type of rock with multicolor spots)

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Heterogenous → visually not uniform, distinct layers

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Which of these mixtures are heterogeneous? 

a. oil and water 

b. salt and water 

c. brass (an alloy of copper and zinc) 

d. granite (a type of rock with multicolor spots)

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