Which is correct:
Florence is built on both sides of the Arno River.
or
Florence was built on both sides of the Arno River.
Source: The ILI English Series, Intermediate 1 Workbook, Page 56
Which is correct:
Florence is built on both sides of the Arno River.
or
Florence was built on both sides of the Arno River.
Source: The ILI English Series, Intermediate 1 Workbook, Page 56
Florence was built on both sides of the Arno River.
Florence is built on both sides of the Arno River.
Both are acceptable. Past participles with BE may be parsed in two ways: as components of the passive construction or as predicate adjectivals.
In the first example, built is understood as a component of the passive construction: the sentence asserts a past event.
In the second example, built acts as an adjectival: the sentence asserts a current state.
Note that although a simple present will usually designate a state and a simple past will usually designate an event, it is the entire discourse context, not the tense of the auxiliary, which determines which interpretation is to be applied. Passive built may be employed in the present tense:
New US suburbs are built mostly by developers.
And adjectival built may be employed in the past tense:
Ancient Rome was built mostly of brick.
ADDED:
Note, too, that these parsings are not necessarily exclusive. The name 'participle' designates an entity which 'partakes' of the nature of two different categories simultaneously, and in some circumstances both the adjectival and verbal properties of a past participle will be present. As Cardinal points out in the comments, saying that something is made of a particular substance implies an adjectival parsing; but this may occur in a context which is also clearly passive, such as that cited by nekomatic where the by phrase designates the agent of a passive construction:
Ewelme palace, in Oxfordshire, was built of brick by William Delapole, in the reign of Henry VI. (my emphasis)
use past tense because the building process of Florence was hundreds years ago.
Both sentences are correct but have sligtly different meanings.
Sentence "Florence was built on both sides of Arno Rinver." is focused to the past. It slightly implies that building of Florence or the connection between Florence and Arno River is over. I think more suitable sentences are "Pompeii was built under the Mount Vesuvius." or "Florence was founded on both sides of arno River."
Sentence "Florence is built on both sides of Arno River" is focused to the present. Ith slightly implies that Florence was and still is on both sides of Arno River.
Sentence "Florence is being built on both sides of Arno River." imply that there was no Florence and that the construction is happening now.
Your question:
Florence is built on both sides of the Arno River.
or
Florence was built on both sides of the Arno River.
You are asking which sentence is correct. The building process of Florence was finished long time ago. So, you can't use 'is' in the sentence if you want to use past tense. However, 'was built' implies that Florence was built by someone else. Look at the following sentences:
John ordered Daisy to go to the market.
Daisy was ordered to go to the market.
The first sentence is active voice statement. The second sentence is passive. In passive voice sentence, we can guess that Daisy was ordered by someone else to go to the market. Your passive voice sentence (Number 2 sentence) also has been used in this sense.
Its question about logic.
It is build so it exists still.
It was built and then removed or maybe still exists.
It is build beeing right now- still in construction.
It was built 2 times.