18 . true / false

tides are caused by the force of inertia from the sun and moon acting on earth
(1point )

a. true

b. false

What is a reasonable action that provides safe water for communities?

The earth's internal process which drives seafloor spreading is

Explore the ways that boundaries influence identity, interaction and exchange. things to consider: what is the race/ethnicity. how easy is it to interact/trade with others.