Here's why:

* Landforms are natural features of the Earth's surface. They can be created by various geological processes like erosion, deposition, volcanic activity, or tectonic plate movement.

* Loess dunes are hills of wind-blown silt (loess) that accumulate in areas with dry climates.

* Moraines are piles of rock and sediment deposited by glaciers.

Both loess dunes and moraines are distinct features of the Earth's surface, making them landforms.