Sublimation can occur because solids have
a. a melting point.
b. a vapor pressure.
c. a boiling point.
d. a triple point.

The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called

Which of the following is a measure of the amount of light a star directly emits? a. luminosity b. wavelength c. brightness d. intensity

True or false. epeirogenic changes deform the crust.