Igneous rocks form when magma or lava cools and hardens into a rock. Magma and lava are rocks that are so hot they move like a liquid. Magma is molten rock that is underground; lava is molten rock that is above the ground â and that is the only difference between them.A common igneous rock is granite.gneous rocks form when magma or lava cools and hardens into a rock. Magma and lava are rocks that are so hot they move like a liquid. Magma is molten rock that is underground; lava is molten rock that is above the ground â and that is the only difference between them.
In partial hydrogenation, the resulting fats are semi-solid at room temperature. In full hydrogenation, the oils become completely solid. The problem with partially hydrogenated oils is that they contain trans fat, which raises LDL (âbadâ) cholesterol, lowers HDL (âgoodâ) cholesterol and has other harmful effects. In contrast, fully hydrogenated oils, in essence, become saturated fatsâbut they contain no trans fat.
Iâve noticed that the peanut butter I buy contains partially and fully hydrogenated oil. Does that mean it contains trans fat? âR.B., Brooklyn, N.Y.tâs true that partially hydrogenated vegetable oilâwhich manufacturers add to many peanut butters to keep them from separatingâsupplies trans fat, an especially unhealthy form of fat that may harm the heart, among other things, by raising bad (LDL) cholesterol and lowering good (HDL) cholesterol.