Please Help!! ;v; According to the theory proposed by Harry Hess, what causes continents to move?

0 continental drift

0 magnetic polarity

0 seafloor spreading

0 deep-ocean trenches

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

Hey can you me with this i really need y’all