Why is petroleum such a sought-after natural resource? a it is an extremely rare substance. b it has such a wide variety of important uses. c it is a relatively clean burning source of fuel. d it is more difficult to extract than other fossil fuels.

Which was the more threat to soviet control of eastern europe: the hungarian uprising (1956)or events in czechoslovakia (1968)? explain your answer by reference to each

What was one of the difficulties adams faced as president? a. european countries were trying to move back in on u.s. lands b. possible war with england; fighting between political parties c. problems with spain; trade disputes with russia d. census issues; problems with selecting a new capital

Which events are correlated but do not necessarily have a causal relationship?