How did scientists determine earth has layers?
through the use of earthquake waves
through deep core drilling
through x-ray analysis
through the use of magnetometers

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.

The physical processes that create most of earth's physical features, including mountains, are known as

Which of teh following would explain the importance of the trans-siberian railroad to russia's economy? (schoology test)