Answer:
Igneous rocks form either when they cool very slowly deep within the Earth (intrusive) or when magma cools rapidly at the Earth's surface (extrusive). Rock may melt to create magma if temperature increases, pressure decreases, or water is added. Different minerals melt at different temperatures.
Explanation:
Answer: angular distance north or south from the celestial equator measured along a great circle passing through the celestial poles
Explanation:
A.
B is wrong since water is not soluble in lipids
Constant means non-changing, so constant would refer to something that stays the same, does not change.
So the correct answer is this one: the quantity that must remain the same