Question

in 1986, the worlds worst nuclear power plant accident occurred at chernobyl, ukraine, in the former soviet union. a chemical explosion and fire released more than fifty tons of radiation into the atmosphere. an emergency team responded by pouring boron and sand on the debris. the boron was meant to prevent more nuclear reaction; the sand was to stop the fire and release of radiation. soon after the accident, a team built a concrete and steel structure, known as a sarcophagus, to prevent rainwater from causing another explosion. over time, however, a new complication arose: the structure eroded. this crisis inspired more than forty countries and organizations to find a better answer. in enormous structure called the new safe confinement (nsc) was built. the nsc covers the sarcophagus and forms an airtight seal.
match the problems with their solutions.
the explosion caused a fire.
erosion damaged the sarcophagus.
rainwater might have triggered another explosion.
problem
solution
a crew poured sand on the reactor.
a crew built a concrete structure to seal the reactor.
the nsc was built.

Explanation:

• For "The explosion caused a fire": According to the text, "An emergency team responded by pouring boron and sand on the debris. The boron was meant to prevent more nuclear reaction; the sand was to stop the fire...". So the solution "A crew poured sand on the reactor" matches this problem.
• For "Rainwater might have triggered another explosion": The text says "a team built a concrete and steel structure, known as a sarcophagus, to prevent rainwater from causing another explosion". So the solution "A crew built a concrete structure to seal the reactor" matches this problem.
• For "Erosion damaged the sarcophagus": The text mentions "the HSC covers the sarcophagus and forms an air - tight seal". So the solution "The HSC was built" matches this problem.

Answer:

• The explosion caused a fire - A crew poured sand on the reactor.
• Rainwater might have triggered another explosion - A crew built a concrete structure to seal the reactor.
• Erosion damaged the sarcophagus - The HSC was built.