The illustration below shows the Gulf Stream carrying warm water up the east coast of America on its way to Western Europe. These warm equatorial surface currents are responsible for the moderate winter climates of certain countries such as France and Spain. Which of the following is most responsible for this occurrence? The sun heats earth’s oceans causing convection currents to travel from the equator to the poles.
Differences in the ocean’s salinity cause deep water convection currents.
Convection within earth’s mantle caused by a hot iron core.
Global wind patterns that determine the direction of surface curren

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)