Ques:Q: What is the name for the sinking of the dense, salty seawater in cold climates? Read this paragraph and choose the correct option from the provided answers: Water becomes more dense when it is colder and when it has more salt. In the North Atlantic Ocean, cold winds chill the water at the surface. Sea ice grows in this cold water, but ice is created from fresh water. The salt is left behind in the seawater. This cold, salty water is very dense, so it sinks to the bottom of the North Atlantic. Downwelling can take place in other places where surface water becomes very dense (see Figure below ). Choices: - cyclones - jet stream - tidal activity - downwelling A:

Ans:downwelling
-----
Ques:Q: Calcium hydroxide and calcium carbonate are effective in neutralizing the effects of what on lakes? Read this paragraph and choose the correct option from the provided answers: Calcium hydroxide and calcium carbonate are effective in neutralizing the effects of acid rain on lakes. Suggest other compounds that might be effective in treating lakes. Give a plausible reason to explain why Ca(OH)2 and CaCO3 are used. ♦️ Approximately 95% of the chlorine produced industrially comes from the electrolysis of sodium chloride solutions (brine): NaCl(aq) + H2O(l) Cl2(g) + H2(g) + NaOH(aq) Chlorine is a respiratory irritant whose presence is easily detected by its penetrating odor and greenishyellow color. One use for the chlorine produced is in the manufacture of hydrochloric acid. Choices: - oil rain - ozone rain - dioxide rain - acid rain A:

Ans:acid rain
-----
Ques:Q: The important equation pv = nrt holds true for substances in what state of matter? Read this paragraph and choose the correct option from the provided answers: PV = nRT This equation is known as the ideal gas law. An ideal gas is defined as a hypothetical gaseous substance whose behavior is independent of attractive and repulsive forces and can be completely described by the ideal gas law. In reality, there is no such thing as an ideal gas, but an ideal gas is a useful conceptual model that allows us to understand how gases respond to changing conditions. As we shall see, under many conditions, most real gases exhibit behavior that closely approximates that of an ideal gas. The ideal gas law can therefore be used to predict the behavior of real gases under most conditions. As you will learn in Section 10.8 "The Behavior of Real Gases", the ideal gas law does not work well at very low temperatures or very high pressures, where deviations from ideal behavior are most commonly observed. Choices: - solids - liquids - products - gas A:

Ans:gas
-----
Ques:Q: What is a thin layer of gas that surrounds earth called? Read this paragraph and choose the correct option from the provided answers: The atmosphere is a thin layer of gas that surrounds Earth. Climatologists study the atmosphere. These scientists work to understand the climate as it is now. They also study how climate will change in response to global warming. Choices: - the cloud cover - the dioxide - the wind cycle - the atmosphere A:

Ans:
the atmosphere
-----