9th Grade El Nino Quizzes , Questions & Answers

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Kelvin Waves Quiz: Ocean Dynamics and Thermocline Shifts

This assessment focuses on Kelvin waves and their role in ocean dynamics and thermocline shifts. You'll explore key concepts such as wave propagation and temperature stratification, enhancing your understanding of these crucial...

Questions: 15 | Attempts: 23 | Last updated: Mar 23, 2026

Sample Question 1
What is an oceanic Kelvin wave, and what role does it play in the development of El Nino?

A surface wind pattern that blows westward along the equator reinforcing the trade winds

A type of tropical storm that forms in the central Pacific during warm ENSO conditions

A large-scale oceanic wave that travels eastward along the equator, guided by the Coriolis effect, carrying a pulse of warm water that deepens the thermocline in the eastern Pacific and contributes to El Nino development

A deep-sea current that transports cold Antarctic water northward along the South American coast

Sample Question 2
The thermocline is the layer of rapid temperature change that separates the warm surface mixed layer from the cold deep ocean, and its depth varies significantly across the tropical Pacific.

True

False

Sample Question 3
Why does the depth of the thermocline in the eastern Pacific matter for sea surface temperatures during El Nino?

A deeper thermocline in the east increases upwelling, cooling the surface and preventing El Nino

A deeper thermocline has no influence on eastern Pacific sea surface temperatures

Thermocline depth only affects eastern Pacific temperatures during La Nina, not during El Nino

When the thermocline deepens in the eastern Pacific, the cold water upwelling draws from a warmer layer rather than the cold deep ocean, reducing its cooling effect and allowing sea surface temperatures to rise

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