Which of the following statements about sidereal and solar days is not true? view available hint(s) which of the following statements about sidereal and solar days is not true?
a. a solar day is approximately 4 minutes longer than a sidereal day.
b. a solar day is the amount of time between successive appearances of the sun on our meridian.
c. a sidereal day is the amount of time between successive appearances of any star on our meridian.
d. a sidereal day is the definition of a day on the earth, and a solar day is the definition of a day on the sun.

B. solar day is the successive appearances of the Sun on our meridian.

Explanation:

This is calculated by the position of the sun on the horizon and the unit of measuring solar time is a day. Thus the successive appearance of the sun on the meridian for consecutive days is thus not possible, as the 24 hours format is applied. As apparent from the sun being measured from the earth the solar time caused due to the motion of the actual sun, this is caused due to the two factors like the earth's orbital motion and the axial tilt. Further summons a constant speed, along the celestial equator and its speed are the same as the average speed of the sun.

Answer (d) may increase or decrease porosity through dissolution or deposition;

Ithink is a i believe