What was the independent variable in the above experiment?
A) The location of the fields
B) The number of grasshoppers after 10 weeks
C) The number of grasshoppers receiving the pesticide
D) Whether pesticide Z was applied
D
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What kind of forces act on the crust at divergent boundaries?
A. compressional forces that crunch and shorten the crust by folding and faulting B. compressional forces that crunch the crust and generate a spreading center C. compressional forces due to plate collision D. tensional forces that stretch the crust and generate a spreading center
Why are there no well-defined horizons in this soil profile?
A) It is usually frozen
B) The area was recently covered by an ocean
C) Abundant leaf litter covers the surface
D) A volcano recently erupted in the area
E) It was recently deposited in a landslide
How do stalagmites enter into the debate on global warming? What will be an ideal response?
Clay sediments and shale generally have _____
a. high permeability and high porosity b. low permeability and low porosity c. high permeability and low porosity d. low permeability and high porosity e. no permeability and no porosity