Which of these is an environmental effect of building dams?

increased water temperature upstream

sediment builds up downstream

weed growth upstream

increased fertility downstream

is this a psat question, if so do not cheat try your best.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.

answerparathyroid gland;