La noria y el carrusel son atracciones.

Because the subject is compound: la noria y el carrusel = two things joined by y.

In Spanish, when two singular nouns are joined by y, the verb usually goes in the plural:

• La noria y el carrusel son atracciones.
• El perro y el gato son animales.

If there were only one thing, you would use es:

• La noria es una atracción.

Spanish usually uses the definite article more often than English does. Here, each noun has its own article because each one is a separate noun in the list:

• la noria
• el carrusel

This is the normal way to say it. Spanish generally does not drop the article here.

Compare:

• La noria y el carrusel son atracciones.
• not usually Noria y carrusel son atracciones.

Because atracciones is being used as a category, not as a specific set of attractions.

In sentences with ser, Spanish often leaves out the article when you say what something is in a general sense:

• Juan es profesor.
• Los perros son animales.
• La noria y el carrusel son atracciones.

If you said las atracciones, it would sound more like you mean some specific attractions already known from the context.

In this sentence:

• la noria is feminine
• el carrusel is masculine
• atracción is feminine, so the plural is atracciones

There is not always a perfect rule, so gender often has to be learned with the noun itself. That is why it is helpful to memorize nouns together with their article:

• la noria
• el carrusel
• la atracción

Because it is plural.

Spanish plural formation here works like this:

• If a noun ends in a vowel, usually add -s
• If a noun ends in a consonant, usually add -es

So:

• atracción → atracciones

Also notice that the written accent disappears in the plural. That is normal:

• atracción
• atracciones

The stress pattern changes naturally once -es is added, so the accent mark is no longer needed.

Grammatically, it is possible, but it is not the most natural choice in a simple classification sentence.

• son atracciones = they are attractions
• son unas atracciones = they are some attractions / they are quite something as attractions, depending on context

In neutral textbook-style Spanish, son atracciones is the best choice here.

Yes. Spanish allows some flexibility in word order, depending on emphasis.

These are possible:

• La noria y el carrusel son atracciones.
• Son atracciones la noria y el carrusel.
• Las atracciones son la noria y el carrusel.

The first one is the most straightforward and neutral. The others are possible, but they shift the focus a little.

Usually yes, but there is one important spelling change:

y becomes e before words that begin with an i sound.

For example:

• padre e hijo
• España e Italia

But in your sentence, y stays y because el carrusel does not begin with an i sound:

• La noria y el carrusel...

Yes, but the verb would need to agree with the new subject.

For example:

• La noria es una atracción.
• El carrusel es una atracción.

With one subject, use es.
With both together, use son.

Also notice that with a singular countable noun, Spanish normally uses una here:

• es una atracción

But with the plural category statement, Spanish naturally says:

• son atracciones

In Spain, carrusel is pronounced roughly like kah-rroo-SEL, with the stress on the last syllable.

The rr is a strong rolled r. It is different from a single r between vowels.

So in carrusel, try to make a trilled sound:

• ca-rru-sel

This is one of the pronunciation features learners often need to practise separately.

It is a standard word, and in Spain it is the normal word for a Ferris wheel. In other Spanish-speaking countries, you may also hear different expressions, such as:

• rueda de la fortuna
• vuelta al mundo in some places

So if you are learning Spanish from Spain, noria is the right word to focus on here.

Because atracciones is not an adjective here; it is a noun acting as the predicate after ser.

The sentence is saying that both things belong to the group called atracciones. Since atracción is a feminine noun, its plural form is atracciones, regardless of the mixed genders of la noria and el carrusel.

This is different from adjectives, which often do need to agree with the nouns they describe.