Question

question 21 select the way that humans can negatively affect aquifers. humans build roads, which prevents rainwater from replenishing aquifers. humans prefer to use lake water as a source of drinking water rather than aquifers. humans build seawalls, which prevent seawater from entering aquifers. humans line and seal wells to prevent pollutants from entering an aquifer.

Explanation:

Road - building creates impervious surfaces. Rainwater that could recharge aquifers is instead diverted or runs off, reducing aquifer replenishment. Using lake water doesn't directly harm aquifers. Preventing seawater from entering (which is often a good thing to avoid salt - water intrusion) and sealing wells to prevent pollution are positive actions for aquifers.

Answer:

Humans build roads, which prevents rainwater from replenishing aquifers.