Scientists are worried about Cumbre Vieja because the wall of the volcano weaker and if the wall collapsed, tones of rock would fall ino the sea. This will (lepiej "would") cause a big wave; LIKELY A tsunami.
The biggest wave will reach the Africa coast (albo "African coast" albo "coast of Africa") in less than an hour.
Europe in less danager than America because the side of the volcano which would protect [European and in Europe..bez sensu] is [less a place..popracuj dalej] which product (zle slowo, szukasz czasownika) a lot of a dangerous measures??? (co to ma znaczyc?)
The wave COULD BE 12 meters HIGH when it reacheS THE SHORES/COAST of Portugal.
It would travel a long way inland in the Caribbean and South America because the wave must travel a lot of kilometerS inland (dlaczego?).
Scientists can install a lot of a radar and they want TO put better equipment on Cumbre Vieja. IF scientists collapsed only part of the volcano (in?? nie rozumiem, czy to ma byc onto/into itself??) then the RESULTING tsunami would be much smaller.