La Niña es un patrón climático periódico que se produce en el Océano Pacífico, caracterizado por temperaturas superficiales del mar más frías de lo normal en la región central y oriental ecuatorial. Forma parte del ciclo de la Oscilación del Sur (ENSO), opuesto a El Niño. Durante La Niña, los vientos alisios se intensifican, desplazando aguas cálidas hacia el oeste y permitiendo que aguas más frías asciendan en el este. Esto puede resultar en sequías en partes de América del Sur y el sureste de Asia, mayor precipitación en Australia y el sudeste de África, y patrones climáticos alterados en otras regiones del mundo, como huracanes más frecuentes en el Atlántico. Sus efectos suelen durar de uno a tres años y pueden influir en la agricultura, la pesca y los eventos meteorológicos extremos.
Table of contents
- Part 1: OnlineExamMaker AI quiz generator – Save time and efforts
- Part 2: 20 La Niña quiz questions & answers
- Part 3: Try OnlineExamMaker AI Question Generator to create quiz questions
Part 1: OnlineExamMaker AI quiz generator – Save time and efforts
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Part 2: 20 La Niña quiz questions & answers
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1. What is La Niña?
A) A warming of ocean waters in the eastern Pacific
B) A cooling of ocean waters in the central and eastern Pacific
C) A period of normal ocean temperatures
D) A sudden increase in global sea levels
Correct Answer: B
Explanation: La Niña is characterized by cooler-than-average sea surface temperatures in the central and eastern equatorial Pacific, which is the opposite of El Niño.
2. How does La Niña typically affect weather patterns in the southwestern United States?
A) Increased rainfall and flooding
B) Decreased rainfall and drought conditions
C) Higher temperatures year-round
D) Stronger hurricanes
Correct Answer: B
Explanation: La Niña often leads to drier conditions in the southwestern U.S. due to shifts in atmospheric circulation that divert moisture away from the region.
3. Which of the following is a common global impact of La Niña?
A) Flooding in Australia
B) Drought in Indonesia
C) Cooler temperatures in the eastern Pacific
D) All of the above
Correct Answer: D
Explanation: La Niña can cause flooding in parts of Australia, drought in Indonesia, and cooler ocean temperatures in the eastern Pacific, affecting weather worldwide.
4. What is the primary difference between La Niña and El Niño?
A) La Niña involves warmer waters, while El Niño involves cooler waters
B) La Niña involves cooler waters, while El Niño involves warmer waters
C) La Niña affects only the Atlantic, while El Niño affects the Pacific
D) There is no difference; they are the same phenomenon
Correct Answer: B
Explanation: El Niño features warmer-than-average sea surface temperatures in the Pacific, whereas La Niña features cooler temperatures, leading to opposite weather effects.
5. During a La Niña event, what happens to the trade winds in the Pacific Ocean?
A) They weaken significantly
B) They strengthen and blow towards the east
C) They reverse direction
D) They disappear entirely
Correct Answer: B
Explanation: La Niña is associated with stronger trade winds that push warm water towards Asia and allow cooler water to rise in the eastern Pacific.
6. Which organization monitors La Niña events?
A) World Health Organization
B) National Oceanic and Atmospheric Administration (NOAA)
C) United Nations
D) International Monetary Fund
Correct Answer: B
Explanation: NOAA, along with other agencies, monitors and predicts La Niña events as part of the El Niño-Southern Oscillation (ENSO) cycle.
7. How does La Niña influence hurricane activity in the Atlantic Ocean?
A) It increases the number of hurricanes
B) It decreases the number of hurricanes
C) It has no effect on hurricanes
D) It only affects Pacific storms
Correct Answer: B
Explanation: La Niña typically reduces hurricane activity in the Atlantic by enhancing wind shear, which disrupts storm formation.
8. What is the typical duration of a La Niña event?
A) 1-2 months
B) 6-18 months
C) 2-5 years
D) 10 years or more
Correct Answer: B
Explanation: La Niña events generally last between 6 and 18 months, though they can sometimes persist longer.
9. In which ocean does La Niña primarily occur?
A) Atlantic Ocean
B) Indian Ocean
C) Pacific Ocean
D) Arctic Ocean
Correct Answer: C
Explanation: La Niña is a Pacific Ocean phenomenon involving temperature anomalies in the equatorial region.
10. What economic impact can La Niña have on agriculture in Southeast Asia?
A) Increased crop yields due to more rain
B) Decreased crop yields due to drought
C) No significant impact
D) Only positive effects on fishing
Correct Answer: B
Explanation: La Niña often brings drought to Southeast Asia, reducing water availability and leading to lower agricultural output.
11. How does La Niña affect marine life in the eastern Pacific?
A) It increases fish populations near the coast
B) It decreases fish populations due to warmer waters
C) It has no effect on marine life
D) It causes massive algae blooms
Correct Answer: A
Explanation: Cooler waters during La Niña bring nutrient-rich waters to the surface, boosting fish populations in areas like the coasts of Peru and Ecuador.
12. What role does the Southern Oscillation play in La Niña?
A) It measures atmospheric pressure differences
B) It is unrelated to La Niña
C) It only affects El Niño
D) It predicts earthquakes
Correct Answer: A
Explanation: The Southern Oscillation refers to the see-saw pattern of atmospheric pressure between the eastern and western Pacific, which is a key component of La Niña.
13. Which U.S. region might experience heavier snowfall during La Niña?
A) The Southeast
B) The Northwest
C) The Midwest
D) The Southwest
Correct Answer: B
Explanation: La Niña can lead to increased precipitation and snowfall in the northwestern U.S. due to altered jet stream patterns.
14. What is a potential long-term effect of frequent La Niña events?
A) Global warming acceleration
B) Changes in global weather patterns and ecosystems
C) Decreased ocean acidity
D) Rise in sea levels
Correct Answer: B
Explanation: Repeated La Niña events can alter long-term weather patterns, affecting ecosystems, agriculture, and water resources worldwide.
15. How is La Niña detected?
A) By measuring sea surface temperatures
B) By observing lunar cycles
C) By tracking bird migrations
D) By monitoring earthquakes
Correct Answer: A
Explanation: Scientists detect La Niña primarily through measurements of sea surface temperatures in the Pacific Ocean.
16. What weather condition is common in South America during La Niña?
A) Excessive rainfall in the west
B) Drought in the north
C) Mild temperatures everywhere
D) Snow in the Amazon
Correct Answer: B
Explanation: La Niña often causes drought in northern South America, while bringing wetter conditions to the southern parts.
17. Can La Niña influence global temperatures?
A) Yes, it generally cools global temperatures
B) No, it only affects local weather
C) Yes, it warms global temperatures
D) It has no impact on temperatures
Correct Answer: A
Explanation: La Niña tends to lower global average temperatures slightly by redistributing heat in the ocean.
18. What is the relationship between La Niña and the jet stream?
A) It strengthens the jet stream over the Pacific
B) It weakens the jet stream globally
C) It has no effect on the jet stream
D) It shifts the jet stream southward over North America
Correct Answer: D
Explanation: La Niña can shift the jet stream southward, leading to colder and wetter conditions in the southern U.S. and warmer conditions in the north.
19. How does La Niña impact the fishing industry in Peru?
A) It reduces fish catches due to warmer waters
B) It increases fish catches due to upwelling
C) It has no effect on fishing
D) It causes overfishing
Correct Answer: B
Explanation: The upwelling of nutrient-rich cold water during La Niña boosts plankton and fish populations, benefiting Peru’s fishing industry.
20. What is the El Niño-Southern Oscillation (ENSO)?
A) A cycle that includes both El Niño and La Niña
B) Only La Niña events
C) A type of ocean current
D) A weather pattern in the Atlantic
Correct Answer: A
Explanation: ENSO is the broader cycle encompassing El Niño (warming) and La Niña (cooling) phases in the Pacific Ocean.
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