State the factor that affect the gravity of a planet​

When an object is heated it contracts. a. true b. false

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.