John is a farmer who wants to keep his soil as productive as possible. Which of these actions would help him achieve this goal? A.
excessive irrigation
B.
crop rotation
C.
soil exhaustion
D.
leaching

After examining the evidence at a site, a geologist thinks that a river could have once flowed through the area. what evidence would support this conclusion? a) the site is a vast, open grassland. b) a high level of tectonic activity is present. c) this location contains igneous rocks everywhere. d) many sedimentary rocks with fossils have been found.