Dquestion 9 1 pts the oceanic ridge system is the major site of spreading center volcanism. o formation of magma by partial melting of mantle rocks. formation of basaltic magma. all of these both spreading center volcanism and formation of magma by partial melting of mantle rocks. 1 pts d question 10

Using complete sentences, describe the central economic problem facing all humans. why does this require people to make choices? how can this result in opportunity costs?

Acity developer is considering building an amusement park near a local river. what tool would the developer predict the future path of the river? a. series of city maps from nearby cities b. series of topographic maps in chronological order c. guide map of the new amusement park d. thermal map of the area

Asap! ! ! ! true or false the gobi desert, the largest desert in asia. covers parts of northern china and southern russia