Answer:
C. The concentration of the copper sulfate is too low
Explanation:
The unit used to measure wavelength is a Nano-meter
Nuclear fusion and heat (thermal) energy
The answer is A. Mountains form because tectonic plates overlap. Earthquakes form because of the moving of tectonic plates. The moving of tectonic plates causes holes in the crust so magma from the mantle escapes and erupts from volcanoes. I hope I helped!