The path of the seismic wave changes at the boundaries of each layer because a. seismic waves always change direction after a few miles. b. each layer has different properties. c. each layer is made out of the same material. d. the layers are different sizes.

Ascientist wants to determine the effect of a new type of gasoline. he fillsone car with normal gasoline and another identical car with the new gasoline.which is the control group? a. the new type of gasolineb. the car with the normal gasolinec. the car with the new gasolinethe amount of gasoline usedd. the amount of gasoline used

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity hurry!

The negative impacts of nonnative species generally outweigh the positive impacts