3. Gallium is a metal that turns into a liquid when held in a person's hand. How can this change in gallium be described?
a. The gallium is undergoing sublimation.
b. The gallium has reached its boiling point.
C. The gallium has reached its melting point.
d. The gallium is undergoing condensation.
ute to make a

dang you just copied and pasted

explanation:

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.