Waves that travel in the same direction they are moving are called what?

What is the mercury length of time for one revolution around the sun?

Most countries in the middle east must import a majority of their a. gasoline b. oil c. food d. water

Why have the countries of the region had difficulty establishing democratic governments in recent years? choose all answers that are correct b is also correct i need to know if theres any morecommunists have overtaken the countries of the caucasus region. the soviets established national borders in the region without considering the location of ethnic groups. fighting continues between armenia and azerbaijan over the nagorno-karabakh region. civil war between communists and islamic groups in tajikistan resulted in thousands of deaths and refugees are forced to flee. in a test!