Glaciers can only form when
a. there is an ice age.
b. there is a u-shaped valley in the mountains.
c. the amount of snow exceeds the amount of rain.
d. more snow falls than melts.

i do believe that its called,(the segovia highlands); plz check first good luck;

question

which are human systems?

the amazon rain forest

the appalachian trail

the george washington bridge

the himalayas

the hoover dam

the north american free trade agreement