The density of an object with a volume of 60.0ml and a mass of 400.0g is

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called

Most of the carbon on earth is stored in the form of

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.