Essay contest on the occasion of International Day for the Preservation of the Ozone Layer! • Test your ecological knowledge: "Young Naturalist" public organization invites you to an intellectual contest! • School of courage and humanism: "Young rescuers" competition heldEssay contest on the occasion of International Day for the Preservation of the Ozone Layer! • Test your ecological knowledge: "Young Naturalist" public organization invites you to an intellectual contest! • School of courage and humanism: "Young rescuers" competition held
