पर्जन्यो वा अग्निर्गौतम तस्य संवत्सरएव समिदभ्राणि धूमो विद्युदर्चिरशनि-रङ्गारा ह्रादुनयो विस्फुलिङ्गास्तस्मिन्नेत-स्मिन्नग्नौ देवाः सोमँ राजानं जुह्वतितस्या आहुत्यै वृष्टिः संभवति ॥ १० ॥
In plain words
Parjanya, the rain-cloud, is a fire, Gautama. The turning year itself is its fuel; the clouds are its smoke, lightning its flame, the thunderbolt its coals, the rolling thunder its sparks. Into this fire the gods pour King Soma as their offering -- and from that offering, rain is born.
Close to the Sanskrit
Parjanya, indeed, is a fire, O Gautama; of it, the year alone is the fuel; the clouds are the smoke; lightning is the flame; the thunderbolt is the coals; the thunder-peals are the sparks. In this, in this very fire, the gods offer Soma the king. From that oblation, rain arises.