Question

which of the following is an example of the dangers posed by excavations? asphyxiation fire water accumulation all of the above

Explanation:

Asphyxiation can occur due to lack of oxygen in excavations (e.g., from cave - ins or gas displacement). Fire can be a danger if flammable substances are present. Water accumulation (e.g., from groundwater or flooding) is also a known hazard in excavations. So all these are dangers.

Answer:

All of the above