Description:

The correct answer is:

✅ Heat redistribution

Why?

Ocean currents act like a global conveyor belt, moving warm and cold water to regulate climate:

Warm Currents (e.g., Gulf Stream):

Heat coastal areas (e.g., keeps NW Europe milder than Canada at similar latitudes).

Cold Currents (e.g., California Current):

Cool adjacent land (e.g., San Francisco’s foggy summers).

Weather Impacts:

Moisture Supply: Warm currents fuel hurricanes (e.g., Atlantic storms).

Rainfall Patterns: El Niño shifts currents, causing floods/droughts worldwide.

Why Not the Others?

❌ Volcanic activity: Affects oceans temporarily (e.g., ash blocking sunlight) but doesn’t drive currents.

❌ Earth’s magnetic field: Shields from solar radiation but doesn’t influence weather directly.

Fun Fact: The Gulf Stream transports 30x more water than all rivers combined! 🌊🔥

Bonus: Without currents, the equator would boil and poles freeze solid. 🌍❄️