The ozone layer protects us from the harmful effects of which type of radiation? a. ultraviolet
b. radio
c. microwave
d. infrared

An asteroid is discovered in a nearly circular orbit around the sun, with an orbital radius that is 2.47 times earth's. what is the asteroid's orbital period, its "year," in terms of earth years?

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

=force × distance a. work b. velocity c. pressure d. momentum