Mid-ocean ridges, which contribute to the process of sea-floor spreading, form as a result of .

A. earthquake activity that causes subduction

B. a rift valley, like the Red Sea, being filled

C. older ocean floor that moves toward the ridge

D. volcanic activity that produces magma

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time

What are characteristics of minerals? select 3 choices