Will give 10 pts which statements best describe how the great rift valley in africa formed? check all that apply. the rift valley formed when the crust pulled apart. the rift valley formed at a divergent boundary. the rift valley formed similarly to an island arc. the rift valley formed at a convergent boundary. the rift valley formed when tectonic plates separated.

If a particular resource is not useful or needed then the price would be considerably low. once that resource is needed the price or value will raise depending on how useful or needed it is especially if the resource is low in quantity, the consumers would pay whatever they have to, to get that material.

Answer is b)eutrophication occurs when excess nutrients are present in aquatic ecosystems, resulting in the increased production of plant life and the subsequent decrease in the oxygen levels of the watereutrophication occurs when there are excess nutrients in a body of water. this results in plants having more food and reproducing  more, sometimes leading to more aquatic animal life as well. ultimately, this can reduce the oxygen level in the ecosystem.