Write the number 0.0000087 in scientific notation.

Compare and contrast the bohr model and the electron cloud models of the atom.

Light waves can move through , but they travel fastest when they move through a(n) .

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)