UnScramble this Word: e m o t n v r?

Questions

The frequent flooding of the Huang He, or ______ _____, has earned it the nickname "China's Sorrow". Along with other rivers in China, it has caused some of the worst natural disasters of all time?

The Top 10, Countries with the most captive elephants (zoos, circuses, etc)?

Named by William Buckland in 1824, this dinosaur's name means "great lizard"?

The Top 10, Deadly Spiders you might want to stay away from?

The Top 10, Heaviest carnivores (meat-eaters) in the world?