Where was oil production at its highest in the 1980s and still remains important to the russian economy? a. central asia b. the ural mountains c. russian siberia d. the caucasus region

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks

What is the pattern of urbanisation around the word?

Heyi am new to are you all americans? ( just want to know , i don't mean any offence ) ?