VOICED: Humans linked to dust cloud damage

Dust storms in the southwest are becoming more frequent and intense due to human activities like coal burning and cattle grazing. Researchers from the University of Colorado are studying dust layers to understand these changes. Dust contains harmful metals like arsenic and lead, posing health risks, but it also fertilizes land. Scientists aim to clarify dust's dual role in the environment.

What is the main reason for the increased dust content in storms in the southwest?

• Global warming

• Decreased rainfall

• Increased human activity

• Natural climate changes

Which of the following is NOT a source of dust pollution mentioned in the video?

• Motorized vehicles

• Solar panels

• Cattle grazing

• Coal burning

What hazardous elements are often found in dust due to human activities?

• Hydrogen and helium

• Carbon dioxide and methane

• Arsenic and lead

• Oxygen and nitrogen

How many fatalities are attributed to contaminated dust each year?

• 70,000

• 60,000

• 80,000

• 50,000

Besides being harmful, how does dust benefit the environment?

• By fertilizing land with nutrients

• By cooling the atmosphere

• By increasing rainfall

• By reducing air pollution