Where does the water come from to start the “hydrological cycle”?

Correct Answer: D

Rationale: The correct answer is D: From oceans. The hydrological cycle starts with water evaporating from oceans due to solar energy. This evaporated water forms clouds, which eventually release precipitation back to earth. This continuous process of evaporation, condensation, and precipitation is known as the hydrological cycle. The other choices, A, B, and C, are incorrect because water primarily comes from oceans to initiate this cycle, not from reservoirs, glaciers, ice caps, lakes, or rivers.

Correct Answer: B

Rationale: The correct answer is B because prion diseases are caused by abnormal proteins called prions that can infect the brain. Eating the brain of an infected animal can introduce these prions into your body, leading to prion disease. Choice A is incorrect because prion diseases are not transmitted through touch alone. Choice C is incorrect because simply eating any brain does not guarantee infection with prions. Choice D is incorrect because prion diseases are not solely transmitted through cattle feed, but rather through direct consumption of infected brain tissue.

Correct Answer: A

Rationale: The correct answer is A. Hazardous chemicals were disposed of improperly at Love Canal, leading to the pollution disaster. This is supported by historical evidence and investigations that revealed the dumping of toxic chemicals by Hooker Chemical. Choice B is incorrect as it inaccurately states that Hooker Chemical donated their waste dump to the school system. Choice C is incorrect because the development of the land did not ignore the fact that it was a former waste dump; rather, it was developed without awareness of the extent of pollution. Choice D is incorrect as it suggests that the development was done in ignorance, which is not accurate based on the facts of the case.

Correct Answer: B

Rationale: The correct answer is B: Methane. Landfills produce methane as a byproduct of the decomposition of organic waste in an anaerobic environment. Methane is a potent greenhouse gas that contributes to climate change. Ozone (choice A) is not produced by landfills, but is a secondary pollutant formed by the reaction of sunlight with pollutants like NOx and VOCs. Carbon dioxide (choice C) is also emitted from landfills, but methane has a much higher global warming potential. Polyaromatic hydrocarbons (PAHs) (choice D) may be present in landfill leachate but are not the primary pollutant produced by landfills.

Correct Answer: D

Rationale: The correct answer is D: Asthma. Asthma is the most common occupational respiratory disease due to exposure to various triggers in the workplace. It is characterized by inflammation and narrowing of the airways, leading to symptoms like wheezing and shortness of breath. Emphysema (A) and Chronic Obstructive Pulmonary Disorder (B) are typically caused by long-term exposure to cigarette smoke, not necessarily occupational factors. Lung cancer (C) is often associated with smoking or exposure to carcinogens, not specifically related to occupation. Asthma is the most common occupational respiratory disease due to exposure to triggers like dust, chemicals, or fumes in the work environment.