Why was Earth very hot at the beginning of its formation? Select all that apply. Heat came from Earth being continuously struck by other small bodies.
Heat came from nuclear fusion happening in the core of Earth.
Heat came from radiation that was produced by nearby stars.
Heat came from the supernova that led to the formation of the solar system.

heat came from the supernova that led to the formation of solar system

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2