Tallus
A volcanic mountain with a wide base and gently sloping sides is called a shield. Shield volcanoes form very large.
the oppposite OS the base of a mountain is the summit
It would be known as a Shield volcano.
"Base" of a mountain is widely recognized as correct.
Talus Slope.
"Scree, also called talus, is a term given to an accumulation of broken rock fragments at the base of crags, mountain cliffs, or valley shoulders."http://en.wikipedia.org/wiki/Scree
foothills
A foothill.
foothills
If you're talking Appalachian mountains, it's called the Piedmont.
50 base pairs
A volcanic mountain with a wide base and gently sloping sides is called a shield. Shield volcanoes form very large.
the peak of the mountain
base of a mountain
base and arrange
the oppposite OS the base of a mountain is the summit
The base word of mountaineering is "mountain."