8. Colin decided to investigate soil erosion by water. He measured rates of erosion on model hills made of soil, rock, and sand. Which of the following
was the test (independent) variable? *

Which kind of aquatic ecosystem does the photograph most likely show? a. marsh b. swamp c. lake d. river

Study the image of this rock.which characteristic best supports its formation from sedimentary processes? it has many layers.it is coarse-grained.its grain shape is round.its texture is non-banded.

What does natural resource management aim at ?