1. Which is true of a radioisotope that is used to date rock formations?
O It has a short half-life.
O It is a plentiful isotope.
O It is a rare isotope.
O It has a long half-life.

Seawater contains approximately 3.5%nacl by mass and has a density of 1.02 g/ml. what volume of seawater contains 7.5 g of sodium?

Which of these features are formed when hot groundwater is forced out through cracks in the earth's surface?

You exhale co2 which is produced during cellular respiration.  co2 combines with the water in your blood's plasma to make up one half of the body's most important buffer pair, carbonic acid.  the more physical activity you engage in, the more co2 your body is producing.  you can see this by putting some of the cabbage indicator in a glass and then blowing bubbles into it through a straw.  can you see a change in the color of the indicator?