If a fossil originally had 200 g of C-14 how old would that fossil be if only 100 g remained? What about 25 g?

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.

For most stars, what does a higher temperature tend to to with? a lower luminosity a higher luminositya red color none of the above