The number below and to the right of an element in a chemical formula. it represents the number of atoms of that element in chemical compound or molecule.

Write the complete balanced equation for the reaction between lead (iv) oxide (pbo2) and water (h2o).

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

Read these sentences from the text. near the equator, the tropics receive the most rain on a consistent basis. as a result, the fresh water falling into the ocean decrease the salinity of the surface water in that region. [. .] . . as the salt content of sea water increases, so does its density. what can you infer about how rain affects the density of surface water near the equator?