types:
grotta
a geological formation consisting of an underground enclosure with access from the surface of the ground or from the sea
delta
a low triangular area of alluvial deposits where a river divides before entering a larger body of water
massiccio
a block of the earth's crust bounded by faults and shifted to form peaks of a mountain range
foce
the point where a stream issues into a larger body of water
pendio
an elevated geological formation
ghiaione
a sloping mass of loose rocks at the base of a cliff
proda,
riva,
sponda
sloping land (especially the slope beside a body of water)
alveo,
letto
a depression forming the ground under a body of water
cratere
a bowl-shaped depression formed by the impact of a meteorite or bomb
geyser
a spring that discharges hot water and steam
iceberg
a large mass of ice floating at sea; usually broken off of a polar glacier
calotta polare
a mass of ice and snow that permanently covers a large area of land (e.g., the polar regions or a mountain peak)
icefield
a large flat mass of ice (larger than an ice floe) floating at sea
icefield
a flat mass of ice (smaller than an ice field) floating at sea
montagna,
monte
a land mass that projects well above its surroundings; higher than a hill
inghiottitoio
a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
fondovalle,
valle
a long depression in the surface of the land that usually contains a river