The "a" europe's second longest river forms a border between romania and "b" before it drains into the "c" sea.

"a" options
rhine, vardar, elba, danube

"b" options
slovenia, croatia, albania, serbia

"c" options
black, ionian, baltic, adriatic.

Which city area has the most accessible oil reserves a) caspian sea b) siberia c)arctic coast d)lake baikal

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed

What foreign policy developed in both europe and asia as a result of nationalism