Question

the use of mobile cellular phones has increased global communication, yet like all forms of technology, there are some environmental costs. metals such as tin, tantalum, tungsten, and gold are used in the manufacturing of mobile phones. which environmental costs are most likely a result of an increase in mobile - cell phone use? using mobile phones reduces the use of automobiles which decreases the amount of gasoline used in order to communicate with others. mobile phone companies have decreased the size of cell phones and package volume. the cost of mining the metals for the manufacturing of the mobile phone can increase the rate of recycling. mobile phones contain metals that can leach into landfills when they are disposed of improperly.

Explanation:

The question asks about environmental costs of mobile - cell phone use. Option A is an environmental benefit. Option B is about product design and not an environmental cost. Option C about recycling rate increase is not a cost. Option D mentions the environmental cost of metal leaching into landfills from improper disposal of mobile phones.

Answer:

D. Mobile phones contain metals that can leach into landfills when they are disposed of improperly.