which soil horizon has very little organic matter and accumulates soluble metals and nutrients that are transported from other soil layers?

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.

because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.

answerpeople organize large projects such as levee-building;

i think it's a but not entirely sure