Select all the answers that apply. scientists think past changes in climate have been caused by
a. milankovitch cycles
b. air pollution
c. plate tectonics
d. volcanic activity
e. mountain ranges
f. thermohaline circulation

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.