The tastiest cuts of beef are often the ones with more fat. But when you're concerned about your health or you're trying to watch your weight, you want the leanest cuts of beef. You don't necessarily have to sacrifice flavor by choosing lean cuts of beef, though. Use this guide on cuts of beef to make smart choices.
Limestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO 3).
Quick Answer. Natural chalk is a common form of calcium carbonate. Unlike other, chemically similar minerals, chalk deposits are laid down by living organisms known as coccolithophores. These microscopic animals thrive in the warm, shallow seas that proliferated in the Cretaceous Period, which derives its name from the Latin word for chalk.