In a spontaneous reaction - a. the reaction happens very quickly. b. additional heat is required to make it occur. c. no additional heat is required to make it occur. d. additional heat is absorbed from the environment.

The condition in which joints are inflamed is bursitis select the best answer from the choices provided ot f

The terrestrial planets are characterized by having a a.) silicate core b.) iron-rich silicate core c.) iron-rich metallic core d.) none of these

Label the following as inner or outer planets; a) has 67 moons made mostly of hydrogen and helium b) has rings c)no moons, high volcanic activity d) known as the red planet, has 2 moons e) very thin atmosphere, moons or rings