âº The coasts of the continents surrounding the Atlantic ocean could, if the continents were moved closer, fit together like a jigsaw puzzle. Reconstruction of previous position continents created with TimeTrek. âº Living animals in widely separated lands are similar.
The rock limestone is mostly made up of one of two types of mineral â either calcite or aragonite. Both of these are different crystal arrangements of the same chemical compound â calcium carbonate (CaCO 3).
The Acid Test for Carbonate Minerals. Limestone is a sedimentary rock that is composed primarily of calcite. It forms from both the chemical precipitation of calcium carbonate and the transformation of shell, coral, fecal and algal debris into calcite during diagenesis.Limestone also forms as a deposit in caves from the precipitation of calcium carbonate.he Acid Test for Carbonate Minerals. Limestone is a sedimentary rock that is composed primarily of calcite. It forms from both the chemical precipitation of calcium carbonate and the transformation of shell, coral, fecal and algal debris into calcite during diagenesis.