HELP ME!!!!!!!!!!
X)-Fill in each blank with ONE suitable word.
El Nino and La Nina
The tropical Pacific Ocean (1)______________ a warming and cooling cycle. This cycle is a completely natural event and usually (2)___________ between three to seven years.
When the waters become (3)______________, it is called El Nino, and when they become cooler it is called La Nina. During the cycle, the (4)___________ of the ocean can change by around 3oC between the warmest and coolest times.
(5)_____________ off the South American coast have known about this
(6)____________ event for hundreds of years. When it (7)____________, they see a huge fall in the numbers of fish caught. But scientists are only just beginning to
(8)____________ how the event affects Earth’s weather and climate.
1. has
2. lasts
3. warmer
4. temperature
6. natural
7. happens
8. research
