Nitrogen Cycle, Clean Water, Infrastructure

What is the main reason the nitrogen cycle is important to life on Earth?

• It helps produce fossil fuels

• It is central to the production of food

• It controls the water cycle

• It regulates global temperatures

Which element is the main component of the Earth's atmosphere, making up nearly four-fifths of it?

• Oxygen

• Carbon dioxide

• Nitrogen

• Hydrogen

What is a major challenge for sustainable development related to the nitrogen cycle?

• Controlling the impact of agriculture on the global cycle of nitrogen

• Increasing fossil fuel production

• Reducing water usage

• Enhancing solar energy capture

Nitrogen is an essential component of which biological molecules?

• Carbohydrates and lipids

• Amino acids and nucleotides

• Vitamins and minerals

• Fatty acids and enzymes

Why is nitrogen not readily available for use by living organisms?

• It is toxic in its natural form

• Nitrogen molecules do not easily enter into chemical reactions

• It is only found in water

• It is always bonded to oxygen

What is a direct human health problem caused by high nitrate concentrations in drinking water?

• Asthma

• Blue baby syndrome

• Diabetes

• Skin cancer

Which molecule is the most plentiful greenhouse gas mentioned in the text?

• Nitrous oxide

• Carbon dioxide

• Methane

• Ozone

What is a consequence of nitrous oxide remaining in the atmosphere for a long time?

• It dissolves easily in water

• It resists reacting with other chemicals

• It quickly breaks down

• It is absorbed by plants

Which process is fueled in part by nitrogen oxides from fertilizers?

• Acid rain

• Photosynthesis

• Soil erosion

• Water purification

What is a major contributor to the production of aerosols that can cause respiratory illness?

• Reactive nitrogen

• Carbon monoxide

• Water vapor

• Oxygen