Understanding El Nino Effects and Causes

The video discusses El Nino, a climate pattern affecting global weather, marine life, and ocean circulation. It explains the historical context, scientific debates, and the role of Walker circulation. El Nino causes warm water to shift in the Pacific, impacting weather patterns worldwide, leading to floods and droughts. The video also highlights the effects on marine ecosystems and the ongoing scientific exploration of its causes.

What is the average frequency of El Nino events?

• Every 10 years

• Every 20 years

• Every 5 years

• Every 2 years

Which countries are most affected by El Nino due to their reliance on agriculture and fishing?

• Brazil and Argentina

• United States and Canada

• India and China

• Australia and Peru

What happens to the anchovy catch in Peru during an El Nino year?

• It becomes unpredictable

• It increases significantly

• It remains the same

• It decreases

What causes the upwelling of nutrient-rich water off the coast of Peru and Chile?

• Trade winds

• Monsoon winds

• Ekman transport

• Walker circulation

During El Nino, what happens to the ocean currents near the equator?

• They disappear completely

• They remain unchanged

• They weaken and reverse direction

• They strengthen and move westward

What is the Walker circulation?

• A type of ocean current

• A convection cell of air above the earth

• A pattern of trade winds

• A type of monsoon

How does El Nino affect weather patterns in North America?

• It causes consistent rainfall

• It has no effect

• It can alter weather patterns significantly

• It causes extreme heat

What historical period marks the first recorded observation of El Nino?

• Late 1800s

• Late 1900s

• Early 1800s

• Early 1900s

What is the main scientific debate regarding the cause of El Nino?

• Whether it affects only the Pacific Ocean

• Whether it is triggered by atmospheric or oceanic changes

• Whether it occurs every year

• Whether it is caused by human activity

What is the term used for the opposite of an El Nino year, characterized by cooler ocean temperatures?

• La Nina

• El Viejo

• La Vieja

• El Nino Oscuro