What is the main source of chemical weathering

Explanation:

chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals and soluble salts. especially when the water is a bit acidic.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.