Which of the following early urban societies did not always build major cities in river valleys? a. the huang he valleyb. mesopotamiac. the indus valleyd. mesoamerica   

Take a guess im getting rid of my account might as well do it in style a fishing boat, with a ladder in it, is leaning against a wall at the harbor. there are 5 oars and 2 fishing nets in the trawler. the distance between two consecutive steps on the ladder is 1 meter. if waves lashing against the wall rise a half meter in every half hour, how long will it take before 6 steps of the ladder are under the waves?

Which are evidence of the seafloor spreading? a. molten material b. magnetic stripes c. continental material d. drilled core samples e. ocean water samples

Read the article titled "castro resigns." why did the us impose trade sanctions against cuba in 1962?