since hard-shelled organisms evolved about 550 million years ago, billions of tons of limestone rock have been produced from their shells. limestone is made of calcium carbonate, with the formula caco3.

What does the cyclopes invite odysseus back to the island

How do you work out 21.3-8= show your working. plz

The smokey mountains have over 2,100 miles of rushing mountain streams and rivers that flow through the park. in each mile lives a diverse community of native fish, amphibians, insects, and larvae, some of which are found only in the southern appalachians. park managers and scientific researchers test many factors such as fish populations, the watersheds and water tests to determine a) too many lizards are present b) the water quality of the stream c) rainwater is running into local streams d) if visitors to the park are overstaying their welcome