earthquakes are caused when rock underground suddenly breaks along a fault
Answer:
Weathering makes the rocks smooth
North korea's economy was severely weakened in the early 1990s when Soviet Union collapsed in 1991, <span>leaving China as the isolated regime's only major ally.
To add, </span><span>diplomatic relations between the </span>Democratic People's Republic of Korea<span> and the </span>Union of Soviet Socialist Republics<span> (the predecessor state to the </span>Russian Federation<span>) were first established on October 12, 1948 shortly after the Democratic People's Republic of Korea was proclaimed.</span>
Around 1800 (plus or minus about 5 years) is when it was estimated that the world's population had reached 1 billion.
