Every year, eli and his family visit the great sand dunes desert in colorado. eli notices that more sand dunes with varied shapes and sizes appear each year. explain what causes this phenomenon.

When it is summer at the south pole, a. the northern hemisphere is tilted toward the sun. b. the southern hemisphere is tilted away from the sun. c. the northern hemisphere is tilted away from the sun. d. both the southern and northern hemispheres are tilted toward the sun.