Final answer:
Snow is a heterogeneous mixture because the tiny particles that make up snow are not uniformly distributed, meaning different parts of a snowflake can have different properties.
Step-by-step explanation:
Snow is considered a heterogeneous mixture. A homogeneous mixture is a mixture where the components that make up the mixture are uniformly distributed throughout the mixture. In contrast, a heterogeneous mixture is a mixture where the components are not uniform or have localized regions with different properties. Different parts of a snowflake, for example, can have distinctly different numbers and types of tiny particles, such as dust and pollen, trapped inside, making snow a heterogeneous mixture.
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