Which types of rocks can become metamorphic rock? both igneous and metamorphic rock

both igneous and sedimentary rock

clastic sedimentary rock

clastic or chemical sedimentary rock

Which of the four major uses is predicted to change the least by 2020?

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important