Question

why is waste disposal of nuclear materials a serious problem?
underground storage sites cannot be sufficiently protected.
nuclear waste remains active for hundreds of years
no shipping companies want to transport nuclear waste.
rogue terrorists try to gain access to nuclear waste by - products.
question 27 0.4 pts
why do buildings on permafrost have potential structural issues?
ground level permafrost is usually very stable, unlike deeper levels of permafrost.
most thermosyphons dont work properly when installed.
there are not enough geotechnical engineers available to design these buildings.
the heat from buildings melts the ice in the permafrost below and water is then displaced.

Explanation:

First Question (Nuclear Waste Disposal)

To determine why nuclear waste disposal is serious, we analyze each option:

• "Underground storage sites cannot be sufficiently protected" – While protection is a concern, it's not the core reason for the seriousness of disposal.
• "Nuclear waste remains active for hundreds of years" – This is a key factor. Nuclear waste has long - lived radioactivity, so safely storing it for centuries is extremely challenging, making disposal a serious problem.
• "No shipping companies want to transport nuclear waste" – Transportation challenges are secondary to the long - term activity of the waste.
• "Rogue terrorists try to gain access to nuclear waste by - products" – Terrorist access is a security concern but not the primary reason for the disposal problem being serious.

To find why buildings on permafrost have structural issues:

• "Ground level permafrost is usually very stable, unlike deeper levels of permafrost" – This statement is incorrect as permafrost stability is related to temperature changes, not just level.
• "Most thermosyphons don't work properly when installed" – Thermosyphon issues are not the main cause of structural problems.
• "There are not enough geotechnical engineers available to design these buildings" – The number of engineers is not the root cause of structural issues.
• "The heat from buildings melts the ice in the permafrost below and water is then displaced" – Buildings generate heat. Permafrost contains ice. When the ice melts, the ground's structure changes (e.g., it can sink or shift), leading to structural problems in the building.

Answer:

B. Nuclear waste remains active for hundreds of years

Second Question (Buildings on Permafrost)