What are the causes of waves & tides?

Venezuela’s economy relies most heavily on which of the followingvenezuela’s economy relies most heavily on which of the following? a. oil reserves in places such as the eastern llanos b. cattle ranching in the grasslands c. fertile farmland in the andean highlands d. coffee plantations in mountainous areas

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

He resistance of a liquid to flowing is called