What is the origin of glassy igneous rocks? * lava that cooled slowly on Earth's surface

lava that cooled quickly on Earth's surface

silt that settled slowly in ocean water

silt that settled quickly in ocean water

Volcanic glass and glassy rock formed from lava or magma that has a chemical composition close to that of granite

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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.