Odpowiedź:
1. is the original point from which the river flows.
2. process by which an element or compound transitions from its liquid state to its gaseous state below the temperature at which it boils
3. rain, snow, sleet, or hail that falls to or condenses on the ground
4. a river or stream flowing into a larger river or lake
5. ?
6. the process of removing salt from seawater
