विश्व जल दिवस हर साल वैश्विक स्तर पर निम्नलिखित में से किस तिथि को मनाया जाता है?

On which date is World Nature Conservation Day observed globally every year?

Which of the following days is celebrated as 'World Earth Day'?

Which of the following pairs of environment-related days and their dates is correctly matched?