Understanding the Global Sand Crisis

What percentage of the Earth's crust is composed of silicon, a key component of silica sand?

• 42.8%

• 35.2%

• 27.7%

• 15.5%

Why is desert sand not typically used in concrete?

• It contains too many impurities.

• It is too expensive to transport.

• It is too round and smooth.

• It is too rough and angular.

What purity level is required for silicon used in semiconductors?

• 95%

• 99.9999%

• 98%

• 99.9%

What is the main reason Dubai imports sand despite being located in a desert?

• Desert sand is too expensive.

• Desert sand is too contaminated.

• Desert sand is too round and smooth for construction.

• Desert sand is not available in large quantities.

What is the primary component required for making glass from sand?

• Silicon dioxide

• Iron oxide

• Aluminum oxide

• Calcium carbonate

What is one of the major environmental impacts of illicit sand mining?

• Depletion of freshwater resources

• Increased carbon emissions

• Increased air pollution

• Destruction of local ecosystems

What unusual material has been suggested as a replacement for sand in concrete?

• Recycled plastic

• Shredded paper

• Crushed glass

• Pyrolized coffee grounds

What percentage of asphalt used in American roads is recycled back into new asphalt?

• 70%

• 60%

• 50%

• 80%

What is a major challenge in recycling processed forms of sand like silicone polymers?

• They are too expensive to recycle.

• They can only be downcycled a limited number of times.

• They are too heavy to transport.

• They are not widely available.

What is a suggested method to reduce the demand for new sand?

• Increase the use of wind weathered sand

• Import more sand from desert regions

• Develop longer-lasting digital devices

• Ban the use of sand in construction