The reasons why people enjoy hiking 是什么从句

The reasons why people enjoy hiking 是什么从句
The reasons why people enjoy hiking 是什么从句

The reasons why people enjoy hiking 是什么从句
定语从句,the reasons做定语从句的先行词,why是关系副词,
在定语从句中当先行词为the reason(s),定语从句可以用why代替for which.
例如：
The reason why he came is not very convincing.
The reason for which he came is not very convincing.