Marine Ecosystems and Upwelling Concepts

The video explains the processes of upwelling and downwelling in the ocean. Upwelling brings nutrient-rich cold water to the surface, supporting photosynthesis and marine life, which benefits the fishing industry. Downwelling moves warm water to the ocean depths, affecting climate by reducing surface temperatures. The video also discusses the role of gases in seawater, particularly carbon dioxide, which supports larger marine animals in cold waters.

What is the primary benefit of upwelling in ocean ecosystems?

• It brings nutrient-rich water to the surface.

• It increases ocean temperatures.

• It prevents ocean currents.

• It decreases the salinity of seawater.

How does the Earth's rotation influence upwelling?

• It causes ocean water to evaporate.

• It creates consistent wind patterns that drive upwelling.

• It increases the salinity of ocean water.

• It prevents the mixing of ocean layers.

Which marine organisms benefit directly from the nutrients brought up by upwelling?

• Phytoplankton

• Zooplankton

• Large fish

• Coral reefs

Why is upwelling economically important for fisheries?

• It reduces the need for fishing equipment.

• It decreases the cost of fishing licenses.

• It creates dense bait balls of fish.

• It increases the size of fishing boats.

What happens to ocean water during downwelling?

• Cold water rises to the surface.

• Warm water is pushed to the ocean depths.

• Salinity levels decrease.

• Nutrient levels increase at the surface.

How does downwelling help in reducing global warming?

• By increasing ocean salinity.

• By decreasing ocean currents.

• By trapping heat in the ocean depths.

• By releasing carbon dioxide into the atmosphere.

Which gas is most important for shell-building animals in cold waters?

• Nitrogen

• Hydrogen

• Carbon dioxide

• Oxygen

Why are larger marine animals often found in colder waters?

• Colder waters have more sunlight.

• Colder waters have less pressure.

• Colder waters are less salty.

• Colder waters hold more gases like carbon dioxide.

What is the relationship between water temperature and gas solubility in seawater?

• Temperature does not affect gas solubility.

• Gas solubility is higher in saltier water.

• Colder water holds more gas.

• Warmer water holds more gas.

Why do fishermen risk their lives in cold, nutrient-rich waters?

• To catch larger fish and shellfish.

• To avoid warm water predators.

• To reduce fishing costs.

• To find new fishing grounds.