The people living in ancient sumer were forced by heavy annual flooding to build a series of dikes and canals. what was one result of the coordinated labor necessary to achieve this goal?
a. the development of one of the world's first civilizations
b. the creation of a religion that eventually became islam
c. the start of an empire that eventually controlled africa
d. the introduction of agriculture with domesticated plants

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Paraguay is one of the only two countries in the americas that don't have a coastal border. the country is slightly smaller than california. it was under a military dictatorship for 35 years, ending in 1989; today it is a constitutional republic. most of the population is roman catholic, and over 60% of the people live in cities. its environment is threatened by deforestation and water pollution. which of the following facts from the paragraph above best describes an element of paraguay's culture? (apex)

Which type of seismic waves are confined at the surface