Metamorphic grade refers to the temperature and pressure under which a rock was metamorphosed, considered low grade or high grade. Since metamorphic minerals in a rock form under specific conditions, they are used to identify the temperature and pressure of the metamorphic conditions.rotolith or parent rock is the rock type that a metamorphic rock was before it was subjected to metamorphic conditions.
Filtration occurs at the glomerulus, essential a highly coiled loop of tubular cells. Each kidney has millions of these cells. Arterial blood is pumped into the glomerulus. Water and ions are filtered via an osmotic gradient as well as other waste products.
About 70% of lightning occurs over land in the tropics where atmospheric convection is the greatest. This occurs from both the mixture of warmer and colder air masses, as well as differences in moisture concentrations, and it generally happens at the boundaries between them.