10. Which element in magma is most abundant? O A. Oxygen
O B. Silicon
O C. Aluminum
OD. Iron

What does it mean for an allele to be dominant?

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.

Lumps of iron and manganese ore called can be harvested from the seafloor near underwater volcanoes.