What are three heat sources for metamorphism?

magma, geothermal heat, and friction

Explanation:

Magma, geothermal heat, and friction along fault lines are different forms of heat used to change rocks into metamorphic rocks.

use smarts app it gives all theanswers

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )