There are long mountain belts that divide the sea floor and generate new sea floor as magma rises and erupts onto Earth’s surface. What are these mountain belts known as?

Galaxy whose shape seems different follow no set pattern are classified as

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.

The scientific method is limited to investigating physical phenomena that are which of the following? select all that apply. observable repeatable falsifiable unique measurable