El Nino and La Nina Effects

The video explains El Nino and La Nina, focusing on their effects on weather and ecosystems. It covers the role of upwellings in nutrient distribution and the impact of these phenomena on trade winds, precipitation, and marine life. El Nino leads to reduced upwelling and altered weather patterns, while La Nina causes stronger winds and increased upwelling.

What is the primary focus of the video on Earth Science?

• The effects of global warming

• The phenomena of El Nino and La Nina

• The process of photosynthesis

• The structure of the Earth's core

What is the role of upwellings in marine ecosystems?

• They decrease the amount of sunlight reaching the ocean floor.

• They bring nutrients from the deep ocean to the surface.

• They increase the salinity of ocean water.

• They cause ocean currents to reverse direction.

What happens to trade winds during normal conditions in the Pacific Ocean?

• They reverse direction frequently.

• They remain stationary.

• They blow from South America towards the west.

• They blow from the west to the east.

How do El Nino events affect upwellings?

• They cause upwellings to occur in different locations.

• They have no effect on upwellings.

• They suppress upwellings, reducing nutrient availability.

• They strengthen upwellings, increasing nutrient availability.

What is a major weather change during El Nino events?

• No change in weather patterns.

• Drier conditions in the eastern Pacific.

• Increased rainfall in the western Pacific.

• Increased rainfall in the eastern Pacific.

What is the impact of El Nino on bird populations?

• Bird populations migrate to other regions.

• Bird populations remain stable.

• Bird populations decrease due to less food availability.

• Bird populations increase due to more food availability.

What is the primary cause of increased precipitation during El Nino?

• Decreased atmospheric pressure.

• Increased wind speeds.

• Decreased evaporation from cool ocean waters.

• Increased evaporation from warm ocean waters.

What characterizes La Nina events in terms of trade winds?

• Trade winds stop completely.

• Trade winds weaken significantly.

• Trade winds reverse direction.

• Trade winds become stronger than normal.

How do La Nina events affect marine life?

• They cause marine life to migrate to other areas.

• They have no effect on marine life.

• They increase the population of phytoplankton and fish.

• They decrease the population of phytoplankton.

What is the effect of La Nina on ocean temperatures?

• Ocean temperatures become warmer than normal.

• Ocean temperatures fluctuate unpredictably.

• Ocean temperatures remain unchanged.

• Ocean temperatures become cooler than normal.