The four seasonsspring, summer, fall, and winterare caused by the ...

[roselinechinyere27m]

The four seasonsspring, summer, fall, and winterare caused by the Sun's changing its daily altitude over a period of 1 year. The Sun's altitude changes
 a. simply because Earth revolves eastward about the Sun.
  b. simply because Earth rotates on its axis.
  c. simply because Earth's axis is tilted 23.5 from the normal to the ecliptic plane.
  d. because of the combined effects of (A) and (C).

Question 2

When heat is added to a closed system, it goes into
 a. work only.
  b. entropy only.
  c. internal energy only.
  d. either (A) or (C) or both.

[Zebsrer]

Answer to Question 1

d

Answer to Question 2

d