Which of the following is an example of matter?

(a) materials that make up the stars
(b) air
(c) metals, gems and minerals
(d) all of the above

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system

According to the image below, which season is about to begin in the southern hemisphere? a. summer b. autumn c. winter d. spring