In which sentence is the word climbing a gerund?

the explorers were climbing up the steeply sloping mountain.

mr. herrera planted climbing ivy on the side of his house.

the children enjoyed climbing on the playground equipment.

The word 'climbing' is a gerund in "The children enjoyed climbing on the playground equipment".

Explanation: A gerund is a non-finite verb form which functions as a noun. Moreover, a gerund can play different syntactic functions in a sentence: it can act as subject, as direct object or as object of the preposition. In the sentence "The children enjoyed climbing on the playground equipment", "climbing" is a gerund since it is functioning as a noun and acting as the direct object. In contrast, in the other two sentences, "climbing" is a present participle.  

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