4. Scientists have most accurately determined the absolute ages of rock layers by A, factoring rates of sediment deposition.
B. using geologic columns.
C. using radiometric dating methods,
D. determining the rates of erosion.

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

Where would you most likely not find an alpine glacier? the himalayas the rockies the andes flat areas of antarctica

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.