Speaking of habitable, the atmosphere also contains the oxygen we need to breathe to support cellular respiration, the metabolic process that provides the chemical energy necessary for life. How much oxygen is in the air? This project will show you an interesting way to measure the percentage of oxygen in a sample of air in a test tube. The method depends on atmospheric pressure and a chemical reaction that removes oxygen from the air. So, what kind of chemical reaction can remove oxygen from the air? Oxidation of iron, also known as rusting, will do the trick. Exposed iron will rust in the presence of oxygen and water.
The Plott Hound is a medium size breed of dog. They are usually 20-25 inches tall (51-61 cm). Plott Hounds weigh about 45-55 pounds (20-25 kg). They are well-muscled and strong. The Plotts have double coats which are smooth and glossy. They can be any shade of brown, black, or tan. The coat has a striped pattern.
A plot is a scheme, a story, a map charting progress, or a piece of land (as for a garden). To plot is to devise the secret plan, order the events of the story, or track your movement on the map. You could make a whole movie based the word plot. This could be the plot (story): An evil so-and-so hatches a secret plot (scheme) to follow the explorer to a legendary plot (patch) of land with buried treasure. The explorer plots (draws) the best route to the treasure, but the evil so-and-so steals the plot (map) and gets to the treasure first.