The forming of icebergs from glaciers is called calving.
a. true
b. false

True. When icebergs fracture and break apart, the fragments are called icebergs.

They contributed many things, but here are some examples:

1) democracy - democracy as a political system was first implemented in ancient athens
2) some advances in mathematics - such as the pythagoras' law
3) the script - the roman script was adopted from ancient greek.