Which of the following statements best explains the effects of soil erosion?
a soil erosion makes land arable by adding nutrients to the topsoil.
b. soil erosion occurs only in places with natural vegetation, forcing farmers to clear more land.
c. soil erosion adds too much fertilizer to the soil, causing plants to grow too quickly.
d. soil erosion weathers away the topsoil and its valuable nutrients,

Journey stations were established throughout the mongol empire every miles.

The purpose of laws were to restrict the rights of african americans who lived in southern states. a) "jim crow" b) "civil rights" c) "anti prohibition" d) "reconstruction acts"

As you drive in to school, you hear a random radio-show caller arguing that sun exposure really has not been shown to cause skin cancer and that some research suggests that skin cancer is completely genetic and not related to sun exposure at all. at the time, you think that this is a silly argument and that the caller does not know what she is talking about. however, two months later, you are outside without wearing sunscreen, and you find yourself remembering that you had read something about how the sun actually does not cause skin cancer. this process is evidence that has influenced your attitude