You didn't hear something well. ask about it. 1) mont blanc is 4,807 m high.- 2) the mount elbrus is 5,642 m high.- 3) the volga river is 3,530 km long.- 4) the nile river is 6,670 km long.- 5) the mount everest is 8,848 m high.- 6) the amazon river is 6,437 km long.- 7) the mississippi river is 6,420 km long.-