Desert winds blowing sands across the dunes involves what TWO systems? 1.hydrosphere
2.geosphere
3.cryosphere
4.atmosphere

Geosphere and atmosphere.

Explanation:

Earth is a planet that has multiple systems, and even though all of them are unique with their own characteristics, they are all connected, influence each other, and depend on each other in many ways. Two of those systems or spheres are the geosphere and atmosphere, with the geosphere being represented by the crust, while the atmosphere is represented by the air above the surface of Earth.

In this case, we have desert winds blowing sands across the dunes. The desert winds, or any winds for that matter, are air masses, thus they belong to the atmosphere. The sands are sediments, thus they are formed from rocks that have broken apart, meaning that they belong to the geosphere. The conclusion is that the winds as being part of the atmosphere and sands being part of the geosphere create a situation where these two spheres interact with each other.