Which is made from the remains of dead marine organisms over millions of years? a. oil and natural gas b. coal and oil c. coal and natural gas d. oil and uranium a?

Plants can have a positive and negative effect on the rate of weathering

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.

Which of the following is true of all geographic locations on earth?