After the first steps in writing an equation, the equation is balanced by

Which of these features are formed when hot groundwater is forced out through cracks in the earth's surface?

Who examines and coordinates the cleanup of polluted sites?

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.