Cheeks of my dog
valley
D. mountain
Mountain, plateau, valley, hanging valley, ridge, spur, terrace, landslip.
mountain
A moving mountain glacier can carve a U-shaped valley. As the glacier moves downhill, it erodes the sides and bottom of the valley, creating a distinctive U-shaped cross-section. The glacier's immense weight and motion combined with erosion from the ice can shape the landform over time.
no
The opposite landform could be a lowland. Or in the ocean, a trench, deep or abyss. In mountains, the natural opposite of a peak is a valley. The opposite structure of a mountain, where the elevation is lower rather than higher, is a crevasse or chasm.
valley
valley
A cliff, a mountain, a ravine, a gorge, glacial valley, an arête, a cirque, a tarn. an escarpment are some possibilities.
valley
Appalachian, Coastal Plains, Interior Highlands, interior plains, intermontane plateaus & Basin, Pacific Mountain &Valley System , Rocky Mountains, And Superior Uplands