Arturo recently read about watersheds and the direction rivers flowed in the United States. Arturo studied his map of the country and identified rivers and their flow direction. Look at the picture and identify what the black line drawn on the map representsA. the water flow B. the Great Divide
C. the Great Basin
D. the Mississippi Riv

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explanation:

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.