How does convection cause tectonic plates to move? A Convection keeps the plates thin enough to move. B Convection makes the plates solid enough to move. C The rising heat of convection currents moves the almost-liquid rocks. D The pressure of convection bends rocks until they break completely.

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

If the density of water is 1.0 g/cm3, which of these materials would float in water, based on their densities? check all that apply. aluminum cork iron lead wax