How is radiometric dating done? a. the ratio of the isotopes from two different elements is compared over time. b. the ratio of a natural isotope to a radioactively decaying isotope of the same element is compared over time. c. the ratio of two radioactive isotopes is compared over time. d. the ratio of two nondecaying isotopes is compared over time.

Which of these statements best explains how the hydrosphere interacts with the atmosphere to affect global climate? mountains block rain clouds and cause changes in global rainfall and evaporation. humans burn fossil fuels to produce greenhouse gases which cause global warming. humans cut down trees which affects the amount of oxygen in different parts of the globe. greenhouse gases, like carbon dioxide, dissolve in oceans and prevent global warming.