3. What concept is illustrated by the graph's “peaks” at ages 40-44 and 65-69? (A) An unbalanced dependency ratio
(B) Increasing crude birth rates over time
(C) Increasing life expectancy
(D) A baby boom and echo
(E) A need for more effective family planning in certain years
muntries?

What process is believed to be responsible for the formation of the grand canyon? a) diverging tectonic plates b) converging tectonic plates c) erosion over a long period of time d) caving in of the ground due to erosion

During adolescence, most people develop a greater sense of independence a. true b. false

The color contrast between the open ocean and the lagoon between the spit and the mainland. the greater concentration of suspended sediments in the lagoon gives the waters a more turbid appearance. the source of sediment in the lagoon is (are) [(rivers and streams from the mainland) (wind-borne sediment from the spit) (ocean waves washing over the spit) (all of these contribute)].