Question

the gulf stream passes from the gulf of america, northward along the coast of eastern north america, and eastward toward ireland, the united kingdom, and scandinavia. without the gulf stream, these regions would be colder than they are. how does the gulf stream keep these regions warm?
a. it absorbs cold temperatures from the land.

b. it brings warm water, which heats the overlying air.

c. it washes floating ice sheets away from the coasts.

d. it encourages evaporation, which makes the land dry and warm.

Explanation:

To determine how the Gulf Stream keeps regions warm, we analyze each option:

• Option A: The Gulf Stream is a warm ocean current; it doesn't absorb cold from land (land is generally colder in these regions, and the stream is warm, so this is incorrect).
• Option B: Ocean currents like the Gulf Stream carry warm water. The warm water transfers heat to the air above it (through conduction and convection), which then warms the nearby landmasses. This matches the role of a warm ocean current.
• Option C: The Gulf Stream's main warming effect is not about washing ice sheets; its primary role is heat transfer via warm water, so this is incorrect.
• Option D: While evaporation can occur, the Gulf Stream's main warming mechanism is not making land dry (and dryness isn't the primary way to warm regions; the key is heat from warm water to air).

Answer:

B. It brings warm water, which heats the overlying air.