4. What would be the most likely outcome

if an event, such as nuclear war,

caused large amounts of dust and ash

to be put into the atmosphere?

A. The dust and ash would have

little effect on the climate.

B. The dust and ash would block

sunlight, triggering climate

change.

C. The dust and ash in the

atmosphere would trigger

volcanic eruptions.

D. A and B only.

E. A and C only.

B. The dust and ash would block sunlight, triggering climate change.

Explanation:

If such an event as a nuclear war should cause large amount of dust and ash in the atmosphere, this will trigger climate change.

Dust and ash can lead to severe consequences on the global climatic pattern.

The rising dust and ash will block out sunlight and electromagnetic radiation from reaching the earth surface. The earth will become abnormally cold as the source of the earth's heat is cut off. This will lead to freezing of water bodies and more cold-inclined world climate.