If you're referring to streams/rivers of water that run independently of another source in the ocean these are referred to as "currents" and can be very powerful depending on their location.
From 1922-1991, Russia would have been considered a autocratic state.
Answer: A medium-mass star will become a white dwarf at the end of it's life cycle.
Explanation:
The life cycle of a medium-mass star (according to the picture, which I can attach for you if you want) is:
1. Interstellar Cloud
2. Protostar
3. Small Star
4. Red Giant
5. Planetary Nebula
6. White Dwarf
Answer:
Strategies to reduce desertification
Planting more trees - the roots of trees hold the soil together and help to reduce soil erosion from wind and rain. Improving the quality of the soil - this can be managed by encouraging people to reduce the number of grazing animals they have and grow crops instead.