How many fluoride ion (f-1) are needed to balance a lead (iv) ion (pb+4)?

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

|using the periodic tablewarm-upuse the periodic table in the tools bar to answer the following questions. what elemental classification does oxygen belongto? done

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory