What do these two changes have in common, mixing sand and gravel and erosion caused by wind.

The commonality between mixing sand and gravel and erosion caused by wind is that both involve processes related to the movement and displacement of particulate matter.

Explanation:

1. Mixing Sand and Gravel:

In this context, mixing sand and gravel involves combining different types of granular materials. This mixing can occur in various scenarios, such as construction, landscaping, or creating a composite material.

2. Erosion Caused by Wind:

Wind erosion is a process where the wind carries away and displaces soil particles. This natural phenomenon often occurs in arid or windy environments, leading to the movement of fine particles and potential changes in landscape features.

In both cases, there is a focus on the movement, displacement, or interaction of particulate matter, whether it's the intentional mixing of sand and gravel or the natural erosion caused by wind.

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