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).
Sandstone is formed from sediments of small grains, usually quartz. The individual grains may be visible, and can be loosely cemented, often rubbing off in your hand. Limestone usually is composed of finer grained material of calcite origin, such as sea shells, or precipitates of calcite origin.Limestone will effervesce in slightly acidic solutions such as vinegar because of the chemical reaction of calcium carbonate with acid.Sandstones will not have this reaction. think you have it confused, dolomite and limestones are not the same thing: Limestone is composed of calcite or calcium carbonate, CaCO3, and dolostone is composed of dolomi â¦ te or calcium magnesium carbonate, Ca,Mg(CO3).