Question

what do urban areas often replace vegetation with, contributing to heat islands? more trees farmland concrete and steel

Explanation:

To determine the answer, we analyze each option:

• "more trees" would increase vegetation, not replace it, so it's incorrect.
• "farmland" is a type of land with vegetation (crops) or open space, and urban areas typically replace farmland with built infrastructure, but the key here is what replaces vegetation to cause heat islands. Heat islands are caused by materials like concrete and steel (impervious, heat - absorbing surfaces) replacing vegetation.
• "concrete and steel" are common urban construction materials that replace vegetation, leading to heat islands as they absorb and retain heat more than vegetation.

Answer:

concrete and steel