Can anyone help with question 4 and 5.
It will be much appreciated

Which one of the following statements best characterizes change to agriculture in the united states since 1900

Which statements explain reasons why unconformities occur? check all that apply. rocks along a fault break and move. igneous rock forms at earth’s surface. rocks erode and sediment is deposited. no sediment is deposited over a long time. igneous rock forms between sedimentary layers.

What from the columbian exchange had perhaps the biggest impact on the world?