The speed of sound through air increases as the:

Through which medium does sound travel the fastest?

Tectonic activity causes potential energy to build up in the crust. An earthquake occurs when this potential energy is released within the crust. Which statement best describes what happens when the energy is released?

Which describes what happens when sound waves become louder?

An apple appears red when struck by white light. This appearance is because the red light is reflected and the other colors are absorbed. What color will this apple appear to be when struck by blue light?

Which of the following is the best description of a control for an experiment?

Why is it important that an experiment include a control group?

What is the primary reason for including a control in the design of an experiment?

The dependent variable in an experiment

Which of the following is true of the independent variable in an experiment?

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