Explanation:

Understanding the question:
The question asks which option is not a type of natural disaster.

Types of Natural Disasters:
Natural disasters are catastrophic events that occur due to natural processes of the Earth. Some common types of natural disasters include:
- Earthquakes
- Hurricanes
- Floods
- Tornadoes
- Wildfires
- Tsunamis

Analysis of Options:
a) Earthquakes - Earthquakes are natural disasters caused by the shifting of tectonic plates beneath the Earth's surface.
b) Hurricanes - Hurricanes are powerful tropical storms that can cause widespread destruction through strong winds and heavy rainfall.
c) Floods - Floods occur when there is an overflow of water onto land that is usually dry.
d) Volcanic Eruptions - Volcanic eruptions are not mentioned in the list of common natural disasters but are also a type of natural disaster that occurs due to the release of magma from a volcano.

Conclusion:
Based on the analysis, the correct answer is option d) Volcanic Eruptions, as it is also a type of natural disaster.