What are the signs you can see that would show you a chemical reaction has occurred?

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

Much of the general structure and physical properties of the interior of the earth are inferred from: a)deep oil and gas bore holes b)geologic investigations c)analysis of seismic waves d) study of volcanoes

Volume is a measurement of how fast particles of a substance are moving