I think 1991 it was the fall of soviet union
Found at the lowest point of a large drainage area, these seasonal, marsh-like ponds collect and store water from rain and runoff. Unlike vernal pools, playas generally fill when temperatures are unsuitable for plant growth, and often the water is salty, alkali or both.
source- google
Answer:
Black Sea and Caspian Sea
it seperates those ones
These countries are found all over the world.
Russia is in Asia.
Canada is in North America.
China is in Asia.
US is in North America.
Brazil is in South America.
Australia is in Oceania.
India is in Asia.
Argentina is in South America.
Kazakhstan is in Asia.
Sudan is in Africa.
South Africa is in Africa.
Japan is in Asia.
Germany is in Europe.
UK is in Europe.
Jamaica is in North America (or the Caribbean)
The earth tilts for different times of the year. During the summer Alaska is a lot closer to the sun than florida.