Rocks in the earth's mantle contain a higher percentage of and than do rocks in the earth's crust.
a. iron and silicon
b. iron and magnesium
c. silicon and oxygen
d. magnesium and oxygen

Agroup of anthropologists from the future want to study the culture and society of the twenty-first century. they cannot find any written documentation of this time period, so they must conduct an archaeological excavation.identify the artifacts, features, and ecofacts they will find during their fieldwork. what will these items tell the anthropologists about our culture and society?

What did the leaders of the soviet union feel would provide the most protection for their country

The authuor says that in some town hall meeting several thousand citizens might attend and vote . what would you do to make sure a town hall meeting of that many people would run smmothly