(20 points) plot the diurnal variations of solar zenith angle 02 (in degrees) and the insolation at the surface 1, = is cos during 0: 00-24: 00 (local time) on february 15 at 10°n. note that 0- =90° for night times.

Which statements about wells are true? check all that apply. a) wells bring groundwater from the unsaturated zone to the surface of the water. b) wells need to be drilled below the water table. c) if water is pumped from a well too quicky, the well may run dry. d) water from wells is generally not safe to drink. e) water gushes from artesian wells due to pressure.

Which of these scenarios is most similar to the aztec empire's system of agriculture? a. a farmer plants the same crops b. a farmer observes the behavior c. a farmer watches the sun’s patterns d. a farmer plants many different crops

Identify and describe the four stages of the demographic transition model