Answer the following question given this paragraph: Supercritical Fluids If we place a sample of water in a sealed container at 25 C, remove the air, and let the vaporization-condensation equilibrium establish itself, we are left with a mixture of liquid water and water vapor at a pressure of 0.03 atm. A distinct boundary between the more dense liquid and the less dense gas is clearly observed. As we increase the temperature, the pressure of the water vapor increases, as described by the liquid-gas curve in the phase diagram for water (Figure 10.31), and a two-phase equilibrium of liquid and gaseous phases remains. At a temperature of 374 C, the vapor pressure has risen to 218 atm, and any further increase in temperature results in the disappearance of the boundary between liquid and vapor phases. All of the water in the container is now present in a single phase whose physical properties are intermediate between those of the gaseous and liquid states. This phase of matter is called a supercritical fluid, and the temperature and pressure above which this phase exists is the critical point (Figure 10.35). Above its critical temperature, a gas cannot be liquefied no matter how much pressure is applied. The pressure required to liquefy a gas at its critical temperature is called the critical pressure. The critical temperatures and critical pressures of some common substances are given in Table 10.3. Substance. Q: What phase exists when all the water in a container has physical properties intermediate between those of the gaseous and liquid states? Choices: - stationary fluid - hydrothermal fluid - impregnation fluid - supercritical fluid A:
supercritical fluid
(Question)
Answer the following question given this paragraph: Ocean waves are energy traveling through water. They are caused mainly by wind blowing over the water. Q: What are ocean waves mainly caused by? Choices: - tides - gravity - humidity - wind A:
(Answer)
wind
Ques: Answer the following question given this paragraph: The esophagus is a narrow tube that carries food from the throat to the stomach. Food moves through the esophagus because of peristalsis. At the lower end of the esophagus, a circular muscle controls the opening to the stomach. The muscle relaxes to let food pass into the stomach. Then the muscle contracts again to prevent food from passing back into the esophagus. Q: What causes food to move through the esophagus? Choices: - photosynthesis - proteolysis - apoptosis - peristalsis A:
Ans: peristalsis
(Q).
Answer the following question given this paragraph: Amphibians! In order for water-dwelling animals to adapt to life on land, many new adaptations had to take place. First, they needed to be able to breathe air instead of obtaining oxygen from water. And fins don't work well as legs! They needed to be able to move around well on land. Q: What broad category of animals shows adaptations from water-dwelling to land-dweller, including the ability to breathe air and legs to move on land? Choices: - reptiles - birds - herbivores - amphibians A:
(A).
amphibians
Ques:Answer the following question given this paragraph: Converging plates can be oceanic, continental, or one of each. If at least one is oceanic, it will subduct. A subducting plate creates volcanoes. Many of the world's volcanoes are the result of subduction at a convergent plate boundary. A map of the world's active volcanoes is pictured below ( Figure below ). Q: Converging plates can be oceanic, continental, or one of each. if at least one is oceanic, it will subduct. a subducting plate creates what? Choices: - earthquakes - fires - wind - volcanoes A:

Ans:volcanoes
Answer the following question given this paragraph: Q: What do increasing greenhouse gas concentrations in the air do to the earth's temperature? Choices: - Lower it - stable it - Pollute - raise it A:
raise it