Kilometers per second is the approximate speed of light.
a. 300
b. 3,000
c. 30,000
d. 300,000

Which of the following are not typically included in the periodic table? a. atomic mass b. element symbol c. isotopes d. number of electrons

Which of the choices are parts of an atom? select all that apply. a.) compound b.) electron c.) neutron d.) molecule e.) photon f.) proton g.) element

Which of these activities increases the amount of carbon in the atmosphere?