Answer the following question given this paragraph: All life relies on a relatively narrow range of pH, or acidity. That's because protein structure and function are very sensitive to pH. Air pollution can cause precipitation to become acidic. Nitrogen and sulfur oxides, mainly from motor vehicle exhaust and coal burning, create acids when they combine with water in the air. The acids lower the pH of precipitation, forming acid rain . If acid rain falls on the ground, it may damage soil and soil organisms. If it falls on plants, it may kill them (see Figure below ). If it falls into lakes, it lowers the pH of the water and kills aquatic organisms. Q: When the ph of precipitation is lowered because of air pollution, what results? Choices: - abnormal rain - climate change - sleet - acid rain A:
acid rain
(Question)
Answer the following question given this paragraph: Ground subsidence is a consequences of groundwater overuse. Q: Ground subsidence is a consequences of the overuse of what? Choices: - plants - chemicals - topsoil - groundwater A:
(Answer)
groundwater
Ques: Answer the following question given this paragraph: Q: What two-word term refers to the number of different species in the community? Choices: - bacteria richness - group-richness - face-richness - species richness A:
Ans: species richness
(Q).
Answer the following question given this paragraph: Q: The oxygen regions of the water molecules have what kind of charge? Choices: - positive - neutral - certain - negative A:
(A).
negative
Ques:Answer the following question given this paragraph: Mid-wavelength electromagnetic waves are commonly called light. This range of electromagnetic waves has shorter wavelengths and higher frequencies than radio waves, but not as short and high as X rays and gamma rays. Light includes visible light, infrared light, and ultraviolet light. If you look back at Figure above , you can see where these different types of light waves fall in the electromagnetic spectrum. Q: What are mid-wavelength electromagnetic waves commonly referred to as? Choices: - gamma rays - x-rays - electricity - light A:

Ans:light
Question: Answer the following question given this paragraph: Liquid water is formed when water vapor condenses (i. e. , H 2 O(g) H 2 O(l) or when ice melts (i. e. , H 2 O(s) H 2 O(l)). Because water is a molecular substance, it is a poor conductor of electricity in its pure form. However, as we will see later, its conductivity can be improved by the addition of certain substances. Water molecules are polar, and this overall polarity gives rise to many of the properties of water. For example, an interesting effect is seen when water is placed in a static electric field, as shown in the Figure below and the video below. This phenomenon can be explained in terms of the polarity of water molecules. Q: What is type of substance is formed when water vapor condenses or when ice melts? Choices: - toxic water - chemical water - gaseous water - liquid water A:
Answer:
liquid water