What is dry lightning?

Why might have people followed the rivers to find their way into asia

What must happen for new french words to be published in official dictionaries? a. they must be approved by the french academy b. they must be voted on by the people of france c. they must be used by famous french writers d. they must be used by philosophers a. they must be approved by the french academy

Where the main factor that enabled the growth of cities and civilizations was the existence of