Early models of our solar system were usually based on experimentation the best science of the time the discoveries of the best scientists philosophy and religion

The crust of earth may a- continets and ocean floors. b-continents only. c-layers of sedimentary rocks and continents. d-all of the above

Which of the following true? a_volcanoes and earthquakes often near the plate boundaries. b_volcanoes occur whereve there are tall mountains. c_earthquakes cause volcanoes in the same location to erupt violently d_volcanoes and earthquakes occur only where plates are colliding with each other

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.